diff --git a/src/shadowsocks.h b/src/shadowsocks.h
new file mode 100644
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--- /dev/null
+++ b/src/shadowsocks.h
@@ -0,0 +1,43 @@
+/*
+ * shadowsocks.h - Header files of library interfaces
+ *
+ * Copyright (C) 2013 - 2014, 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 pdnsd; see the file COPYING. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SHADOWSOCKS_H
+#define _SHADOWSOCKS_H
+
+typedef struct {
+    char *server;         // server hostname or ip
+    char *method;         // encryption method
+    char *passwd;         // password of server
+    char *config;         // file path to config
+    char *acl;            // file path to acl
+    int server_port;      // port number of server
+    int local_port;       // port number of local
+    int timeout;          // connection timeout
+    int fast_open;        // tcp fast open
+    int verbose;          // verbose mode
+} profile_t;
+
+// create and start a shadowsocks service,
+// if success, return the pid.
+// if not, return -1
+int create_ss_service (profile_t profile, char *log_file);
+
+#endif // _SHADOWSOCKS_H