diff --git a/configure.ac b/configure.ac
index d7cef6b6..a7a17943 100755
--- a/configure.ac
+++ b/configure.ac
@@ -66,7 +66,7 @@ dnl Add library for mingw
 case $host in
   *-mingw*)
     CFLAGS="$CFLAGS -mno-ms-bitfields"
-    LIBS="$LIBS -ladvapi32 -lgdi32 -lws2_32 -lcrypt32"
+    LIBS="$LIBS -lws2_32"
     ;;
   *-cygwin*)
     CFLAGS="$CFLAGS -mno-ms-bitfields"
@@ -93,6 +93,10 @@ case $host in
     os_support=linux
     AC_MSG_RESULT(Linux)
     ;;
+  *-mingw*)
+    os_support=mingw
+    AC_MSG_RESULT(MinGW)
+    ;;
   *)
     AC_MSG_RESULT(transparent proxy does not support for $host)
     ;;
@@ -161,6 +165,10 @@ AC_CHECK_HEADERS([net/if.h], [], [],
 ])
 
 case $host in
+  *-mingw*)
+    AC_DEFINE([CONNECT_IN_PROGRESS], [WSAEWOULDBLOCK], [errno for incomplete non-blocking connect(2)])
+    AC_CHECK_HEADERS([winsock2.h ws2tcpip.h], [], [AC_MSG_ERROR([Missing MinGW headers])], [])
+    ;;
   *-linux*)
     AC_DEFINE([CONNECT_IN_PROGRESS], [EINPROGRESS], [errno for incomplete non-blocking connect(2)])
     dnl Checks for netfilter headers
@@ -219,6 +227,12 @@ AC_CHECK_LIB(socket, connect)
 dnl Checks for library functions.
 AC_CHECK_FUNCS([malloc memset posix_memalign socket])
 
+AC_ARG_WITH(ev,
+  AS_HELP_STRING([--with-ev=DIR], [use a specific libev library]),
+  [CFLAGS="$CFLAGS -I$withval/include"
+   CPPFLAGS="$CPPFLAGS -I$withval/include"
+   LDFLAGS="$LDFLAGS -L$withval/lib"]
+)
 AC_CHECK_HEADERS([ev.h libev/ev.h], [], [])
 AC_CHECK_LIB([ev], [ev_loop_destroy], [LIBS="-lev $LIBS"], [AC_MSG_ERROR([Couldn't find libev. Try installing libev-dev@<:@el@:>@.])])
 
diff --git a/src/Makefile.am b/src/Makefile.am
index dcc5fd9b..4efb8905 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -19,7 +19,10 @@ SS_COMMON_LIBS += -lbloom -lcork -lcorkipset
 endif
 SS_COMMON_LIBS += -lev -lsodium -lm
 
-bin_PROGRAMS = ss-local ss-tunnel ss-server ss-manager
+bin_PROGRAMS = ss-local ss-tunnel ss-server
+if !BUILD_WINCOMPAT
+bin_PROGRAMS += ss-manager
+endif
 
 sni_src = http.c \
           tls.c
@@ -30,41 +33,37 @@ acl_src = rule.c \
 crypto_src = crypto.c \
              aead.c \
              stream.c \
-			 ppbloom.c \
+             ppbloom.c \
              base64.c
 
 plugin_src = plugin.c
 
-ss_local_SOURCES = utils.c \
-                   jconf.c \
-                   json.c \
-                   udprelay.c \
-                   cache.c \
-                   netutils.c \
-                   local.c \
+common_src = utils.c \
+             jconf.c \
+             json.c \
+             udprelay.c \
+             cache.c \
+             netutils.c
+
+if BUILD_WINCOMPAT
+common_src += winsock.c
+endif
+
+ss_local_SOURCES = local.c \
+                   $(common_src) \
                    $(crypto_src) \
                    $(plugin_src) \
                    $(sni_src) \
                    $(acl_src)
 
-ss_tunnel_SOURCES = utils.c \
-                    jconf.c \
-                    json.c \
-                    udprelay.c \
-                    cache.c \
-                    netutils.c \
-                    tunnel.c \
+ss_tunnel_SOURCES = tunnel.c \
+                    $(common_src) \
                     $(crypto_src) \
                     $(plugin_src)
 
-ss_server_SOURCES = utils.c \
-                    netutils.c \
-                    jconf.c \
-                    json.c \
-                    udprelay.c \
-                    cache.c \
-                    resolv.c \
+ss_server_SOURCES = resolv.c \
                     server.c \
+                    $(common_src) \
                     $(crypto_src) \
                     $(plugin_src) \
                     $(sni_src) \
diff --git a/src/aead.c b/src/aead.c
index b85d0384..56cf30ad 100644
--- a/src/aead.c
+++ b/src/aead.c
@@ -31,11 +31,14 @@
 #include <assert.h>
 
 #include <sodium.h>
+#ifndef __MINGW32__
 #include <arpa/inet.h>
+#endif
 
 #include "ppbloom.h"
 #include "aead.h"
 #include "utils.h"
+#include "winsock.h"
 
 #define NONE                    (-1)
 #define AES128GCM               0
diff --git a/src/crypto.c b/src/crypto.c
index c783a6f2..ba74db79 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -372,7 +372,7 @@ crypto_parse_key(const char *base64, uint8_t *key, size_t key_len)
     rand_bytes(key, key_len);
     base64_encode(out_key, out_len, key, key_len);
     LOGE("Invalid key for your chosen cipher!");
-    LOGE("It requires a %zu-byte key encoded with URL-safe Base64", key_len);
+    LOGE("It requires a " SIZE_FMT "-byte key encoded with URL-safe Base64", key_len);
     LOGE("Generating a new random key: %s", out_key);
     FATAL("Please use the key above or input a valid key");
     return key_len;
diff --git a/src/crypto.h b/src/crypto.h
index 69a46945..c86d40f0 100644
--- a/src/crypto.h
+++ b/src/crypto.h
@@ -23,7 +23,9 @@
 #ifndef _CRYPTO_H
 #define _CRYPTO_H
 
+#ifndef __MINGW32__
 #include <sys/socket.h>
+#endif
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/json.c b/src/json.c
index 6012bad7..2a919009 100644
--- a/src/json.c
+++ b/src/json.c
@@ -35,6 +35,12 @@
    #endif
 #endif
 
+#ifdef __MINGW32__
+#define CONV_PTR (uintptr_t)
+#else
+#define CONV_PTR (unsigned long)
+#endif
+
 const struct _json_value json_value_none;
 
 #include <stdio.h>
@@ -138,7 +144,7 @@ static int new_value (json_state * state,
             values_size = sizeof (*value->u.object.values) * value->u.object.length;
 
             if (! (value->u.object.values = (json_object_entry *) json_alloc
-                  (state, values_size + ((unsigned long) value->u.object.values), 0)) )
+                  (state, values_size + (CONV_PTR value->u.object.values), 0)) )
             {
                return 0;
             }
diff --git a/src/local.c b/src/local.c
index b74caac9..47ff491c 100644
--- a/src/local.c
+++ b/src/local.c
@@ -33,12 +33,12 @@
 #include <strings.h>
 #include <unistd.h>
 #include <getopt.h>
-
+#ifndef __MINGW32__
 #include <errno.h>
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <netinet/in.h>
-
+#endif
 #ifdef LIB_ONLY
 #include "shadowsocks.h"
 #endif
@@ -59,6 +59,7 @@
 #include "tls.h"
 #include "plugin.h"
 #include "local.h"
+#include "winsock.h"
 
 #ifndef LIB_ONLY
 #ifdef __APPLE__
@@ -104,8 +105,10 @@ static int udp_fd    = 0;
 
 static struct ev_signal sigint_watcher;
 static struct ev_signal sigterm_watcher;
+#ifndef __MINGW32__
 static struct ev_signal sigchld_watcher;
 static struct ev_signal sigusr1_watcher;
+#endif
 
 #ifdef HAVE_SETRLIMIT
 #ifndef LIB_ONLY
@@ -135,6 +138,7 @@ static server_t *new_server(int fd);
 
 static struct cork_dllist connections;
 
+#ifndef __MINGW32__
 int
 setnonblocking(int fd)
 {
@@ -144,6 +148,7 @@ setnonblocking(int fd)
     }
     return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
+#endif
 
 int
 create_and_bind(const char *addr, const char *port)
@@ -1213,18 +1218,22 @@ signal_cb(EV_P_ ev_signal *w, int revents)
 {
     if (revents & EV_SIGNAL) {
         switch (w->signum) {
+#ifndef __MINGW32__
         case SIGCHLD:
             if (!is_plugin_running())
                 LOGE("plugin service exit unexpectedly");
             else
                 return;
         case SIGUSR1:
+#endif
         case SIGINT:
         case SIGTERM:
             ev_signal_stop(EV_DEFAULT, &sigint_watcher);
             ev_signal_stop(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
             ev_signal_stop(EV_DEFAULT, &sigchld_watcher);
             ev_signal_stop(EV_DEFAULT, &sigusr1_watcher);
+#endif
             keep_resolving = 0;
             ev_unloop(EV_A_ EVUNLOOP_ALL);
         }
@@ -1276,7 +1285,9 @@ main(int argc, char **argv)
     char *plugin_opts = NULL;
     char *plugin_host = NULL;
     char *plugin_port = NULL;
+#ifndef __MINGW32__
     char tmp_port[8];
+#endif
 
     srand(time(NULL));
 
@@ -1501,7 +1512,12 @@ main(int argc, char **argv)
         exit(EXIT_FAILURE);
     }
 
+#ifdef __MINGW32__
+    winsock_init();
+#endif
+
     if (plugin != NULL) {
+#ifndef __MINGW32__
         uint16_t port = get_local_port();
         if (port == 0) {
             FATAL("failed to find a free port");
@@ -1511,6 +1527,9 @@ main(int argc, char **argv)
         plugin_port = tmp_port;
 
         LOGI("plugin \"%s\" enabled", plugin);
+#else
+        FATAL("plugins not implemented in MinGW port");
+#endif
     }
 
     if (method == NULL) {
@@ -1560,6 +1579,7 @@ main(int argc, char **argv)
         LOGI("resolving hostname to IPv6 address first");
     }
 
+#ifndef __MINGW32__
     if (plugin != NULL) {
         int len          = 0;
         size_t buf_size  = 256 * remote_num;
@@ -1577,10 +1597,13 @@ main(int argc, char **argv)
             FATAL("failed to start the plugin");
         }
     }
+#endif
 
+#ifndef __MINGW32__
     // ignore SIGPIPE
     signal(SIGPIPE, SIG_IGN);
     signal(SIGABRT, SIG_IGN);
+#endif
 
     // Setup keys
     LOGI("initializing ciphers... %s", method);
@@ -1621,8 +1644,10 @@ main(int argc, char **argv)
     ev_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
     ev_signal_start(EV_DEFAULT, &sigint_watcher);
     ev_signal_start(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
     ev_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
     ev_signal_start(EV_DEFAULT, &sigchld_watcher);
+#endif
 
     if (strcmp(local_addr, ":") > 0)
         LOGI("listening at [%s]:%s", local_addr, local_port);
@@ -1674,6 +1699,7 @@ main(int argc, char **argv)
     else
 #endif
 
+#ifndef __MINGW32__
     // setuid
     if (user != NULL && !run_as(user)) {
         FATAL("failed to switch user");
@@ -1682,6 +1708,7 @@ main(int argc, char **argv)
     if (geteuid() == 0) {
         LOGI("running from root user");
     }
+#endif
 
     // Init connections
     cork_dllist_init(&connections);
@@ -1694,9 +1721,11 @@ main(int argc, char **argv)
     }
 
     // Clean up
+#ifndef __MINGW32__
     if (plugin != NULL) {
         stop_plugin();
     }
+#endif
 
     if (mode != UDP_ONLY) {
         ev_io_stop(loop, &listen_ctx.io);
@@ -1711,6 +1740,10 @@ main(int argc, char **argv)
         free_udprelay();
     }
 
+#ifdef __MINGW32__
+    winsock_cleanup();
+#endif
+
     return 0;
 }
 
@@ -1743,6 +1776,10 @@ _start_ss_local_server(profile_t profile, ss_local_callback callback, void *udat
     sprintf(local_port_str, "%d", local_port);
     sprintf(remote_port_str, "%d", remote_port);
 
+#ifdef __MINGW32__
+    winsock_init();
+#endif
+
     USE_LOGFILE(log);
 
     if (profile.acl != NULL) {
@@ -1753,18 +1790,22 @@ _start_ss_local_server(profile_t profile, ss_local_callback callback, void *udat
         local_addr = "127.0.0.1";
     }
 
+#ifndef __MINGW32__
     // ignore SIGPIPE
     signal(SIGPIPE, SIG_IGN);
     signal(SIGABRT, SIG_IGN);
+#endif
 
     ev_signal_init(&sigint_watcher, signal_cb, SIGINT);
     ev_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
     ev_signal_start(EV_DEFAULT, &sigint_watcher);
     ev_signal_start(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
     ev_signal_init(&sigusr1_watcher, signal_cb, SIGUSR1);
     ev_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
     ev_signal_start(EV_DEFAULT, &sigusr1_watcher);
     ev_signal_start(EV_DEFAULT, &sigchld_watcher);
+#endif
 
     // Setup keys
     LOGI("initializing ciphers... %s", method);
@@ -1848,6 +1889,10 @@ _start_ss_local_server(profile_t profile, ss_local_callback callback, void *udat
         free_udprelay();
     }
 
+#ifdef __MINGW32__
+    winsock_cleanup();
+#endif
+
     return 0;
 }
 
diff --git a/src/netutils.c b/src/netutils.c
index d4254b71..1c119d67 100644
--- a/src/netutils.c
+++ b/src/netutils.c
@@ -28,10 +28,12 @@
 #include "config.h"
 #endif
 
+#ifndef __MINGW32__
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <unistd.h>
+#endif
 
 #if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_NET_IF_H) && defined(__linux__)
 #include <net/if.h>
diff --git a/src/netutils.h b/src/netutils.h
index e5c98707..1565dcf2 100644
--- a/src/netutils.h
+++ b/src/netutils.h
@@ -23,7 +23,11 @@
 #ifndef _NETUTILS_H
 #define _NETUTILS_H
 
+#ifdef __MINGW32__
+#include "winsock.h"
+#else
 #include <sys/socket.h>
+#endif
 
 #ifdef HAVE_LINUX_TCP_H
 #include <linux/tcp.h>
diff --git a/src/plugin.c b/src/plugin.c
index c3d2f5a5..f20c49ed 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -24,6 +24,8 @@
 #include "config.h"
 #endif
 
+#ifndef __MINGW32__
+
 #include <string.h>
 #include <unistd.h>
 #include <sys/socket.h>
@@ -299,3 +301,5 @@ is_plugin_running()
     }
     return 0;
 }
+
+#endif
diff --git a/src/resolv.c b/src/resolv.c
index 3c12c7f5..7e7e42b6 100644
--- a/src/resolv.c
+++ b/src/resolv.c
@@ -32,13 +32,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
-
+#ifndef __MINGW32__
 #include <netdb.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <errno.h>
 #include <unistd.h>
-
+#endif
 #include <ares.h>
 
 #ifdef HAVE_LIBEV_EV_H
@@ -52,6 +52,13 @@
 #include "resolv.h"
 #include "utils.h"
 #include "netutils.h"
+#include "winsock.h"
+
+#ifdef __MINGW32__
+#define CONV_STATE_CB (ares_sock_state_cb)
+#else
+#define CONV_STATE_CB
+#endif
 
 /*
  * Implement DNS resolution interface using libc-ares
@@ -147,7 +154,7 @@ resolv_init(struct ev_loop *loop, char *nameservers, int ipv6first)
     memset(&default_ctx, 0, sizeof(struct resolv_ctx));
 
     default_ctx.options.sock_state_cb_data = &default_ctx;
-    default_ctx.options.sock_state_cb      = resolv_sock_state_cb;
+    default_ctx.options.sock_state_cb      = CONV_STATE_CB resolv_sock_state_cb;
     default_ctx.options.timeout            = 3000;
     default_ctx.options.tries              = 2;
 
diff --git a/src/resolv.h b/src/resolv.h
index 993692d4..e211abc6 100644
--- a/src/resolv.h
+++ b/src/resolv.h
@@ -31,7 +31,9 @@
 #endif
 
 #include <stdint.h>
+#ifndef __MINGW32__
 #include <sys/socket.h>
+#endif
 
 struct resolv_query;
 
diff --git a/src/server.c b/src/server.c
index 3132c4d4..ab3ce1a0 100644
--- a/src/server.c
+++ b/src/server.c
@@ -35,14 +35,14 @@
 #include <unistd.h>
 #include <getopt.h>
 #include <math.h>
-
+#ifndef __MINGW32__
 #include <netdb.h>
 #include <errno.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
 #include <pthread.h>
 #include <sys/un.h>
-
+#endif
 #include <libcork/core.h>
 
 #if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_NET_IF_H) && defined(__linux__)
@@ -56,6 +56,7 @@
 #include "acl.h"
 #include "plugin.h"
 #include "server.h"
+#include "winsock.h"
 
 #ifndef EAGAIN
 #define EAGAIN EWOULDBLOCK
@@ -134,15 +135,20 @@ static char *manager_addr = NULL;
 uint64_t tx               = 0;
 uint64_t rx               = 0;
 
+#ifndef __MINGW32__
 ev_timer stat_update_watcher;
+#endif
 ev_timer block_list_watcher;
 
 static struct ev_signal sigint_watcher;
 static struct ev_signal sigterm_watcher;
+#ifndef __MINGW32__
 static struct ev_signal sigchld_watcher;
+#endif
 
 static struct cork_dllist connections;
 
+#ifndef __MINGW32__
 static void
 stat_update_cb(EV_P_ ev_timer *watcher, int revents)
 {
@@ -218,6 +224,7 @@ stat_update_cb(EV_P_ ev_timer *watcher, int revents)
 
     close(sfd);
 }
+#endif
 
 static void
 free_connections(struct ev_loop *loop)
@@ -320,6 +327,7 @@ setfastopen(int fd)
     return s;
 }
 
+#ifndef __MINGW32__
 int
 setnonblocking(int fd)
 {
@@ -329,6 +337,7 @@ setnonblocking(int fd)
     }
     return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
+#endif
 
 int
 create_and_bind(const char *host, const char *port, int mptcp)
@@ -1409,16 +1418,20 @@ signal_cb(EV_P_ ev_signal *w, int revents)
 {
     if (revents & EV_SIGNAL) {
         switch (w->signum) {
+#ifndef __MINGW32__
         case SIGCHLD:
             if (!is_plugin_running())
                 LOGE("plugin service exit unexpectedly");
             else
                 return;
+#endif
         case SIGINT:
         case SIGTERM:
             ev_signal_stop(EV_DEFAULT, &sigint_watcher);
             ev_signal_stop(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
             ev_signal_stop(EV_DEFAULT, &sigchld_watcher);
+#endif
             ev_unloop(EV_A_ EVUNLOOP_ALL);
         }
     }
@@ -1493,7 +1506,9 @@ main(int argc, char **argv)
     char *server_port = NULL;
     char *plugin_opts = NULL;
     char *plugin_port = NULL;
+#ifndef __MINGW32__
     char tmp_port[8];
+#endif
 
     int server_num = 0;
     const char *server_host[MAX_REMOTE_NUM];
@@ -1717,7 +1732,12 @@ main(int argc, char **argv)
 
     remote_port = server_port;
 
+#ifdef __MINGW32__
+    winsock_init();
+#endif
+
     if (plugin != NULL) {
+#ifndef __MINGW32__
         uint16_t port = get_local_port();
         if (port == 0) {
             FATAL("failed to find a free port");
@@ -1725,6 +1745,9 @@ main(int argc, char **argv)
         snprintf(tmp_port, 8, "%d", port);
         plugin_port = server_port;
         server_port = tmp_port;
+#else
+        FATAL("plugins not implemented in MinGW port");
+#endif
     }
 
     if (method == NULL) {
@@ -1782,16 +1805,20 @@ main(int argc, char **argv)
         LOGI("enable TCP no-delay");
     }
 
+#ifndef __MINGW32__
     // ignore SIGPIPE
     signal(SIGPIPE, SIG_IGN);
     signal(SIGABRT, SIG_IGN);
+#endif
 
     ev_signal_init(&sigint_watcher, signal_cb, SIGINT);
     ev_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
-    ev_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
     ev_signal_start(EV_DEFAULT, &sigint_watcher);
     ev_signal_start(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
+    ev_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
     ev_signal_start(EV_DEFAULT, &sigchld_watcher);
+#endif
 
     // setup keys
     LOGI("initializing ciphers... %s", method);
@@ -1808,6 +1835,7 @@ main(int argc, char **argv)
     if (nameservers != NULL)
         LOGI("using nameserver: %s", nameservers);
 
+#ifndef __MINGW32__
     // Start plugin server
     if (plugin != NULL) {
         int len          = 0;
@@ -1827,6 +1855,7 @@ main(int argc, char **argv)
             FATAL("failed to start the plugin");
         }
     }
+#endif
 
     // initialize listen context
     listen_ctx_t listen_ctx_list[server_num];
@@ -1888,14 +1917,17 @@ main(int argc, char **argv)
         }
     }
 
+#ifndef __MINGW32__
     if (manager_addr != NULL) {
         ev_timer_init(&stat_update_watcher, stat_update_cb, UPDATE_INTERVAL, UPDATE_INTERVAL);
         ev_timer_start(EV_DEFAULT, &stat_update_watcher);
     }
+#endif
 
     ev_timer_init(&block_list_watcher, block_list_clear_cb, UPDATE_INTERVAL, UPDATE_INTERVAL);
     ev_timer_start(EV_DEFAULT, &block_list_watcher);
 
+#ifndef __MINGW32__
     // setuid
     if (user != NULL && !run_as(user)) {
         FATAL("failed to switch user");
@@ -1904,6 +1936,7 @@ main(int argc, char **argv)
     if (geteuid() == 0) {
         LOGI("running from root user");
     }
+#endif
 
     // init block list
     init_block_list();
@@ -1921,15 +1954,19 @@ main(int argc, char **argv)
     // Free block list
     free_block_list();
 
+#ifndef __MINGW32__
     if (manager_addr != NULL) {
         ev_timer_stop(EV_DEFAULT, &stat_update_watcher);
     }
+#endif
 
     ev_timer_stop(EV_DEFAULT, &block_list_watcher);
 
+#ifndef __MINGW32__
     if (plugin != NULL) {
         stop_plugin();
     }
+#endif
 
     // Clean up
 
@@ -1953,5 +1990,9 @@ main(int argc, char **argv)
         free_udprelay();
     }
 
+#ifdef __MINGW32__
+    winsock_cleanup();
+#endif
+
     return 0;
 }
diff --git a/src/stream.h b/src/stream.h
index 97742703..2972a67b 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -23,7 +23,9 @@
 #ifndef _STREAM_H
 #define _STREAM_H
 
+#ifndef __MINGW32__
 #include <sys/socket.h>
+#endif
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/tls.c b/src/tls.c
index 0b2f4a4d..863ae9ef 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -36,7 +36,9 @@
 #include <stdio.h>
 #include <stdlib.h> /* malloc() */
 #include <string.h> /* strncpy() */
+#ifndef __MINGW32__
 #include <sys/socket.h>
+#endif
 
 #include "tls.h"
 #include "protocol.h"
diff --git a/src/tunnel.c b/src/tunnel.c
index 2f8b3373..fc9be825 100644
--- a/src/tunnel.c
+++ b/src/tunnel.c
@@ -29,13 +29,13 @@
 #include <strings.h>
 #include <unistd.h>
 #include <getopt.h>
-
+#ifndef __MINGW32__
 #include <errno.h>
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <pthread.h>
-
+#endif
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -52,6 +52,7 @@
 #include "utils.h"
 #include "plugin.h"
 #include "tunnel.h"
+#include "winsock.h"
 
 #ifndef EAGAIN
 #define EAGAIN EWOULDBLOCK
@@ -98,8 +99,11 @@ static int no_delay = 0;
 
 static struct ev_signal sigint_watcher;
 static struct ev_signal sigterm_watcher;
+#ifndef __MINGW32__
 static struct ev_signal sigchld_watcher;
+#endif
 
+#ifndef __MINGW32__
 static int
 setnonblocking(int fd)
 {
@@ -109,6 +113,7 @@ setnonblocking(int fd)
     }
     return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
+#endif
 
 int
 create_and_bind(const char *addr, const char *port)
@@ -738,16 +743,20 @@ signal_cb(EV_P_ ev_signal *w, int revents)
 {
     if (revents & EV_SIGNAL) {
         switch (w->signum) {
+#ifndef __MINGW32__
         case SIGCHLD:
             if (!is_plugin_running())
                 LOGE("plugin service exit unexpectedly");
             else
                 return;
+#endif
         case SIGINT:
         case SIGTERM:
             ev_signal_stop(EV_DEFAULT, &sigint_watcher);
             ev_signal_stop(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
             ev_signal_stop(EV_DEFAULT, &sigchld_watcher);
+#endif
             keep_resolving = 0;
             ev_unloop(EV_A_ EVUNLOOP_ALL);
         }
@@ -778,7 +787,9 @@ main(int argc, char **argv)
     char *plugin_opts = NULL;
     char *plugin_host = NULL;
     char *plugin_port = NULL;
+#ifndef __MINGW32__
     char tmp_port[8];
+#endif
 
     int remote_num = 0;
     ss_addr_t remote_addr[MAX_REMOTE_NUM];
@@ -993,7 +1004,12 @@ main(int argc, char **argv)
         exit(EXIT_FAILURE);
     }
 
+#ifdef __MINGW32__
+    winsock_init();
+#endif
+
     if (plugin != NULL) {
+#ifndef __MINGW32__
         uint16_t port = get_local_port();
         if (port == 0) {
             FATAL("failed to find a free port");
@@ -1003,6 +1019,9 @@ main(int argc, char **argv)
         plugin_port = tmp_port;
 
         LOGI("plugin \"%s\" enabled", plugin);
+#else
+        FATAL("plugins not implemented in MinGW port");
+#endif
     }
 
     if (method == NULL) {
@@ -1046,6 +1065,7 @@ main(int argc, char **argv)
         FATAL("tunnel port is not defined");
     }
 
+#ifndef __MINGW32__
     if (plugin != NULL) {
         int len          = 0;
         size_t buf_size  = 256 * remote_num;
@@ -1062,17 +1082,22 @@ main(int argc, char **argv)
             FATAL("failed to start the plugin");
         }
     }
+#endif
 
+#ifndef __MINGW32__
     // ignore SIGPIPE
     signal(SIGPIPE, SIG_IGN);
     signal(SIGABRT, SIG_IGN);
+#endif
 
     ev_signal_init(&sigint_watcher, signal_cb, SIGINT);
     ev_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
-    ev_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
     ev_signal_start(EV_DEFAULT, &sigint_watcher);
     ev_signal_start(EV_DEFAULT, &sigterm_watcher);
+#ifndef __MINGW32__
+    ev_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
     ev_signal_start(EV_DEFAULT, &sigchld_watcher);
+#endif
 
     // Setup keys
     LOGI("initializing ciphers... %s", method);
@@ -1149,6 +1174,7 @@ main(int argc, char **argv)
         LOGI("TCP relay disabled");
     }
 
+#ifndef __MINGW32__
     // setuid
     if (user != NULL && !run_as(user)) {
         FATAL("failed to switch user");
@@ -1157,12 +1183,19 @@ main(int argc, char **argv)
     if (geteuid() == 0) {
         LOGI("running from root user");
     }
+#endif
 
     ev_run(loop, 0);
 
+#ifndef __MINGW32__
     if (plugin != NULL) {
         stop_plugin();
     }
+#endif
+
+#ifdef __MINGW32__
+    winsock_cleanup();
+#endif
 
     return 0;
 }
diff --git a/src/udprelay.c b/src/udprelay.c
index 2b774d27..24d55fd2 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -29,13 +29,13 @@
 #include <strings.h>
 #include <time.h>
 #include <unistd.h>
-
+#ifndef __MINGW32__
 #include <arpa/inet.h>
 #include <errno.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <pthread.h>
-
+#endif
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -52,6 +52,7 @@
 #include "netutils.h"
 #include "cache.h"
 #include "udprelay.h"
+#include "winsock.h"
 
 #ifdef MODULE_REMOTE
 #define MAX_UDP_CONN_NUM 512
@@ -105,6 +106,7 @@ static int buf_size                                  = DEFAULT_PACKET_SIZE * 2;
 static int server_num                                = 0;
 static server_ctx_t *server_ctx_list[MAX_REMOTE_NUM] = { NULL };
 
+#ifndef __MINGW32__
 static int
 setnonblocking(int fd)
 {
@@ -114,6 +116,7 @@ setnonblocking(int fd)
     }
     return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
+#endif
 
 #if defined(MODULE_REMOTE) && defined(SO_BROADCAST)
 static int
@@ -724,7 +727,7 @@ remote_recv_cb(EV_P_ ev_io *w, int revents)
         goto CLEAN_UP;
     } else if (r > packet_size) {
         if (verbose) {
-            LOGI("[udp] remote_recv_recvfrom fragmentation, MTU at least be: %zd", r + PACKET_HEADER_SIZE);
+            LOGI("[udp] remote_recv_recvfrom fragmentation, MTU at least be: " SSIZE_FMT, r + PACKET_HEADER_SIZE);
         }
     }
 
@@ -798,7 +801,7 @@ remote_recv_cb(EV_P_ ev_io *w, int revents)
 
     if (buf->len > packet_size) {
         if (verbose) {
-            LOGI("[udp] remote_recv_sendto fragmentation, MTU at least be: %zd", buf->len + PACKET_HEADER_SIZE);
+            LOGI("[udp] remote_recv_sendto fragmentation, MTU at least be: " SSIZE_FMT, buf->len + PACKET_HEADER_SIZE);
         }
     }
 
@@ -902,7 +905,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
         goto CLEAN_UP;
     } else if (buf->len > packet_size) {
         if (verbose) {
-            LOGI("[udp] UDP server_recv_recvmsg fragmentation, MTU at least be: %zd", buf->len + PACKET_HEADER_SIZE);
+            LOGI("[udp] UDP server_recv_recvmsg fragmentation, MTU at least be: " SSIZE_FMT, buf->len + PACKET_HEADER_SIZE);
         }
     }
 
@@ -924,7 +927,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
         goto CLEAN_UP;
     } else if (r > packet_size) {
         if (verbose) {
-            LOGI("[udp] server_recv_recvfrom fragmentation, MTU at least be: %zd", r + PACKET_HEADER_SIZE);
+            LOGI("[udp] server_recv_recvfrom fragmentation, MTU at least be: " SSIZE_FMT, r + PACKET_HEADER_SIZE);
         }
     }
 
@@ -1208,7 +1211,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
 
     if (buf->len > packet_size) {
         if (verbose) {
-            LOGI("[udp] server_recv_sendto fragmentation, MTU at least be: %zd", buf->len + PACKET_HEADER_SIZE);
+            LOGI("[udp] server_recv_sendto fragmentation, MTU at least be: " SSIZE_FMT, buf->len + PACKET_HEADER_SIZE);
         }
     }
 
@@ -1225,7 +1228,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
 
     if (buf->len - addr_header_len > packet_size) {
         if (verbose) {
-            LOGI("[udp] server_recv_sendto fragmentation, MTU at least be: %zd", buf->len - addr_header_len + PACKET_HEADER_SIZE);
+            LOGI("[udp] server_recv_sendto fragmentation, MTU at least be: " SSIZE_FMT, buf->len - addr_header_len + PACKET_HEADER_SIZE);
         }
     }
 
diff --git a/src/utils.c b/src/utils.c
index b9142e7e..9461afd3 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -25,12 +25,14 @@
 #endif
 
 #include <stdlib.h>
-#include <unistd.h>
 #include <string.h>
-#include <errno.h>
 #include <ctype.h>
+#ifndef __MINGW32__
+#include <unistd.h>
+#include <errno.h>
 #include <pwd.h>
 #include <grp.h>
+#endif
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -55,12 +57,14 @@ FILE *logfile;
 int use_syslog = 0;
 #endif
 
+#ifndef __MINGW32__
 void
 ERROR(const char *s)
 {
     char *msg = strerror(errno);
     LOGE("%s: %s", s, msg);
 }
+#endif
 
 int use_tty = 1;
 
@@ -102,6 +106,7 @@ ss_isnumeric(const char *s)
 int
 run_as(const char *user)
 {
+#ifndef __MINGW32__
     if (user[0]) {
         /* Convert user to a long integer if it is a non-negative number.
          * -1 means it is a user name. */
@@ -195,6 +200,9 @@ run_as(const char *user)
         }
 #endif
     }
+#else
+    LOGE("run_as(): not implemented in MinGW port");
+#endif
 
     return 1;
 }
@@ -400,6 +408,7 @@ usage()
 void
 daemonize(const char *path)
 {
+#ifndef __MINGW32__
     /* Our process ID and Session ID */
     pid_t pid, sid;
 
@@ -444,6 +453,9 @@ daemonize(const char *path)
     close(STDIN_FILENO);
     close(STDOUT_FILENO);
     close(STDERR_FILENO);
+#else
+    LOGE("daemonize(): not implemented in MinGW port");
+#endif
 }
 
 #ifdef HAVE_SETRLIMIT
@@ -478,6 +490,7 @@ set_nofile(int nofile)
 char *
 get_default_conf(void)
 {
+#ifndef __MINGW32__
     static char sysconf[] = "/etc/shadowsocks-libev/config.json";
     static char userconf[PATH_MAX] = { 0 };
     char *conf_home;
@@ -498,4 +511,7 @@ get_default_conf(void)
 
     // If not, fall back to the system-wide config.
     return sysconf;
+#else
+    return "config.json";
+#endif
 }
diff --git a/src/utils.h b/src/utils.h
index 09353b67..3b8167f9 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -87,6 +87,35 @@ extern FILE *logfile;
 
 #else // not LIB_ONLY
 
+#ifdef __MINGW32__
+
+#define USE_TTY()
+#define USE_SYSLOG(ident, _cond)
+#define USE_LOGFILE(ident)
+#define TIME_FORMAT "%Y-%m-%d %H:%M:%S"
+#define LOGI(format, ...)                                    \
+    do {                                                     \
+        time_t now = time(NULL);                             \
+        char timestr[20];                                    \
+        strftime(timestr, 20, TIME_FORMAT, localtime(&now)); \
+        fprintf(stdout, " %s INFO: " format "\n", timestr,   \
+                ## __VA_ARGS__);                             \
+    }                                                        \
+    while (0)
+
+#define LOGE(format, ...)                                     \
+    do {                                                      \
+        time_t now = time(NULL);                              \
+        char timestr[20];                                     \
+        strftime(timestr, 20, TIME_FORMAT, localtime(&now));  \
+        fprintf(stdout, " %s ERROR: " format "\n", timestr,   \
+                ## __VA_ARGS__);                              \
+    }                                                         \
+    while (0)
+
+
+#else // not __MINGW32__
+
 #include <syslog.h>
 extern int use_tty;
 extern int use_syslog;
@@ -146,11 +175,30 @@ extern int use_syslog;
         } }                                                                       \
     while (0)
 
+#endif // if __MINGW32__
+
 #endif // if LIB_ONLY
 
 #endif // if __ANDROID__
 
+// Workaround for "%z" in Windows printf
+#ifdef __MINGW32__
+#define SSIZE_FMT "%Id"
+#define SIZE_FMT "%Iu"
+#else
+#define SSIZE_FMT "%zd"
+#define SIZE_FMT "%zu"
+#endif
+
+#ifdef __MINGW32__
+#ifdef ERROR
+#undef ERROR
+#endif
+#define ERROR(s) ss_error(s)
+void ss_error(const char *s); // Implemented in winsock.c
+#else
 void ERROR(const char *s);
+#endif
 
 char *ss_itoa(int i);
 int ss_isnumeric(const char *s);
diff --git a/src/winsock.c b/src/winsock.c
new file mode 100644
index 00000000..68a3af16
--- /dev/null
+++ b/src/winsock.c
@@ -0,0 +1,75 @@
+/*
+ * winsock.c - Windows socket compatibility layer
+ *
+ * Copyright (C) 2013 - 2018, Max Lv <max.c.lv@gmail.com>
+ *
+ * This file is part of the shadowsocks-libev.
+ *
+ * shadowsocks-libev is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * shadowsocks-libev is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with shadowsocks-libev; see the file COPYING. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef __MINGW32__
+
+#include "winsock.h"
+#include "utils.h"
+
+void
+winsock_init(void)
+{
+    int ret;
+    WSADATA wsa_data;
+    ret = WSAStartup(MAKEWORD(2, 2), &wsa_data);
+    if (ret != 0) {
+        FATAL("Failed to initialize winsock");
+    }
+}
+
+void
+winsock_cleanup(void)
+{
+    WSACleanup();
+}
+
+int
+setnonblocking(SOCKET socket)
+{
+    u_long arg = 1;
+    return ioctlsocket(socket, FIONBIO, &arg);
+}
+
+void
+ss_error(const char *s)
+{
+    char *msg = NULL;
+    DWORD err = WSAGetLastError();
+    FormatMessage(
+        FORMAT_MESSAGE_ALLOCATE_BUFFER |
+        FORMAT_MESSAGE_FROM_SYSTEM |
+        FORMAT_MESSAGE_IGNORE_INSERTS,
+        NULL, err,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (LPTSTR)&msg, 0, NULL);
+    if (msg != NULL) {
+        // Remove trailing newline character
+        ssize_t len = strlen(msg) - 1;
+        if (len >= 0 && msg[len] == '\n') {
+            msg[len] = '\0';
+        }
+        LOGE("%s: [%ld] %s", s, err, msg);
+        LocalFree(msg);
+    }
+}
+
+#endif // __MINGW32__
diff --git a/src/winsock.h b/src/winsock.h
new file mode 100644
index 00000000..a20259bb
--- /dev/null
+++ b/src/winsock.h
@@ -0,0 +1,86 @@
+/*
+ * winsock.h - Windows socket compatibility layer
+ *
+ * Copyright (C) 2013 - 2018, Max Lv <max.c.lv@gmail.com>
+ *
+ * This file is part of the shadowsocks-libev.
+ *
+ * shadowsocks-libev is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * shadowsocks-libev is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with shadowsocks-libev; see the file COPYING. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _WINSOCK_H
+#define _WINSOCK_H
+
+#ifdef __MINGW32__
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0600
+#undef _WIN32_WINNT
+#endif
+
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0600
+#endif
+
+#include <windows.h>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+// Override error number
+#ifdef errno
+#undef errno
+#endif
+#define errno WSAGetLastError()
+
+#ifdef EWOULDBLOCK
+#undef EWOULDBLOCK
+#endif
+#define EWOULDBLOCK WSAEWOULDBLOCK
+
+#ifdef CONNECT_IN_PROGRESS
+#undef CONNECT_IN_PROGRESS
+#endif
+#define CONNECT_IN_PROGRESS WSAEWOULDBLOCK
+
+// Override close function
+#define close(fd) closesocket(fd)
+
+// Override MinGW functions
+#define setsockopt(a,b,c,d,e) setsockopt(a,b,c,(const char *)(d),e)
+#define inet_ntop(a,b,c,d) inet_ntop(a,(void *)(b),c,d)
+
+// Override Windows built-in functions
+#ifdef ERROR
+#undef ERROR
+#endif
+#define ERROR(s) ss_error(s)
+#ifndef _UTILS_H
+void ss_error(const char *s);
+#endif
+
+// Missing unistd.h functions
+#define sleep(x) Sleep((x) * 1000)
+
+// Winsock compatibility functions
+int setnonblocking(SOCKET socket);
+void winsock_init(void);
+void winsock_cleanup(void);
+
+#endif // __MINGW32__
+
+#endif // _WINSOCK_H