diff --git a/trunk/configure b/trunk/configure
index 7d58bb896..e850a4bee 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -40,7 +40,7 @@ clean:
 
 server: _prepare_dir
 	@echo "build the srs(simple rtmp server) over st(state-threads)"
-	\$(MAKE) -f ${GLOBAL_DIR_OBJS}/${GLOBAL_FILE_MAKEFILE} server
+	\$(MAKE) -f ${GLOBAL_DIR_OBJS}/${GLOBAL_FILE_MAKEFILE} simple_rtmp_server
 
 # the ./configure will generate it.
 _prepare_dir:
@@ -68,7 +68,7 @@ GCC = g++
 LINK = \$(GCC)
 AR = ar
 
-.PHONY: default server
+.PHONY: default simple_rtmp_server 
 
 default:
 
@@ -82,7 +82,7 @@ LibSTfile="${LibSTRoot}/libst.a"
 MODULE_ID="CORE" 
 MODULE_DEPENDS=() 
 ModuleLibIncs=(${LibSTRoot})
-MODULE_FILES=("srs_core" "srs_core_log" "srs_core_server" "srs_core_error")
+MODULE_FILES=("srs_core" "srs_core_log" "srs_core_server" "srs_core_error" "srs_core_conn")
 MODULE_DIR="src/core" . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 
@@ -100,7 +100,7 @@ MAIN_ENTRANCES=("srs_main_server")
 # srs(simple rtmp server) over st(state-threads)
 ModuleLibFiles=(${LibSTfile})
 MODULE_OBJS="${CORE_OBJS[@]} ${CONFIG_OBJS[@]} ${PROTOCOL_OBJS[@]} ${MAIN_OBJS[@]}"
-BUILD_KEY="server" APP_MAIN="srs_main_server" APP_NAME="server" LINK_OPTIONS="-ldl" SO_PATH="" . auto/apps.sh
+BUILD_KEY="simple_rtmp_server" APP_MAIN="srs_main_server" APP_NAME="simple_rtmp_server" LINK_OPTIONS="-ldl" SO_PATH="" . auto/apps.sh
 
 echo 'configure ok! '
 
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index da153a23d..ab4327437 100755
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -35,4 +35,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     #define __STDC_FORMAT_MACROS
 #endif
 
+#include <assert.h>
+#define SrsAssert(expression) assert(expression)
+
 #endif
\ No newline at end of file
diff --git a/trunk/src/core/srs_core_conn.cpp b/trunk/src/core/srs_core_conn.cpp
new file mode 100755
index 000000000..865067325
--- /dev/null
+++ b/trunk/src/core/srs_core_conn.cpp
@@ -0,0 +1,88 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <srs_core_conn.hpp>
+
+#include <srs_core_log.hpp>
+#include <srs_core_error.hpp>
+#include <srs_core_server.hpp>
+
+SrsConnection::SrsConnection(SrsServer* srs_server, st_netfd_t client_stfd)
+{
+	server = srs_server;
+	stfd = client_stfd;
+}
+
+SrsConnection::~SrsConnection()
+{
+}
+
+int SrsConnection::start()
+{
+	int ret = ERROR_SUCCESS;
+    
+    if (st_thread_create(cycle_thread, this, 0, 0) == NULL) {
+        ret = ERROR_ST_CREATE_CYCLE_THREAD;
+        SrsError("st_thread_create conn cycle thread error. ret=%d", ret);
+        return ret;
+    }
+    SrsVerbose("create st conn cycle thread success.");
+	
+	return ret;
+}
+
+int SrsConnection::do_cycle()
+{
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
+void SrsConnection::cycle()
+{
+	int ret = ERROR_SUCCESS;
+	
+	ret = do_cycle();
+    
+	// success.
+	if (ret == ERROR_SUCCESS) {
+		SrsInfo("client process normally finished. ret=%d", ret);
+	}
+	
+	// client close peer.
+	if (ret == ERROR_SOCKET_CLOSED) {
+		SrsTrace("client disconnect peer. ret=%d", ret);
+	}
+	
+	server->remove(this);
+}
+
+void* SrsConnection::cycle_thread(void* arg)
+{
+	SrsConnection* conn = (SrsConnection*)arg;
+	SrsAssert(conn != NULL);
+	
+	conn->cycle();
+	
+	return NULL;
+}
+
diff --git a/trunk/src/core/srs_core_conn.hpp b/trunk/src/core/srs_core_conn.hpp
new file mode 100755
index 000000000..054d30511
--- /dev/null
+++ b/trunk/src/core/srs_core_conn.hpp
@@ -0,0 +1,52 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef SRS_CORE_CONN_HPP
+#define SRS_CORE_CONN_HPP
+
+/*
+#include <srs_core_conn.hpp>
+*/
+
+#include <srs_core.hpp>
+
+#include <st.h>
+
+class SrsServer;
+class SrsConnection
+{
+private:
+	SrsServer* server;
+	st_netfd_t stfd;
+public:
+	SrsConnection(SrsServer* srs_server, st_netfd_t client_stfd);
+	virtual ~SrsConnection();
+public:
+	virtual int start();
+private:
+	virtual int do_cycle();
+	virtual void cycle();
+	static void* cycle_thread(void* arg);
+};
+
+#endif
\ No newline at end of file
diff --git a/trunk/src/core/srs_core_error.hpp b/trunk/src/core/srs_core_error.hpp
index a69b75521..a6d78fa2e 100755
--- a/trunk/src/core/srs_core_error.hpp
+++ b/trunk/src/core/srs_core_error.hpp
@@ -28,9 +28,20 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_error.hpp>
 */
 
-#define ERROR_SUCCESS 0
+#include <srs_core.hpp>
 
-#define ERROR_ST_SET_EPOLL 100
-#define ERROR_ST_INITIALIZE 101
+#define ERROR_SUCCESS 					0
+
+#define ERROR_ST_SET_EPOLL 				100
+#define ERROR_ST_INITIALIZE 			101
+#define ERROR_ST_OPEN_SOCKET			102
+#define ERROR_ST_CREATE_LISTEN_THREAD	103
+#define ERROR_ST_CREATE_CYCLE_THREAD	104
+
+#define ERROR_SOCKET_CREATE 			200
+#define ERROR_SOCKET_SETREUSE 			201
+#define ERROR_SOCKET_BIND 				202
+#define ERROR_SOCKET_LISTEN 			203
+#define ERROR_SOCKET_CLOSED 			204
 
 #endif
\ No newline at end of file
diff --git a/trunk/src/core/srs_core_server.cpp b/trunk/src/core/srs_core_server.cpp
index 934a68078..f721b0e7c 100755
--- a/trunk/src/core/srs_core_server.cpp
+++ b/trunk/src/core/srs_core_server.cpp
@@ -21,12 +21,21 @@ IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
+#include <srs_core_server.hpp>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <algorithm>
+
 #include <st.h>
 
 #include <srs_core_log.hpp>
 #include <srs_core_error.hpp>
+#include <srs_core_conn.hpp>
 
-#include <srs_core_server.hpp>
+#define SERVER_LISTEN_BACKLOG 10
 
 SrsServer::SrsServer()
 {
@@ -34,6 +43,11 @@ SrsServer::SrsServer()
 
 SrsServer::~SrsServer()
 {
+	for (std::vector<SrsConnection*>::iterator it = conns.begin(); it != conns.end(); ++it) {
+		SrsConnection* conn = *it;
+		delete conn;
+	}
+	conns.clear();
 }
 
 int SrsServer::initialize()
@@ -46,14 +60,14 @@ int SrsServer::initialize()
         SrsError("st_set_eventsys use linux epoll failed. ret=%d", ret);
         return ret;
     }
-    SrsInfo("st_set_eventsys use linux epoll success");
+    SrsVerbose("st_set_eventsys use linux epoll success");
     
     if(st_init() != 0){
         ret = ERROR_ST_INITIALIZE;
         SrsError("st_init failed. ret=%d", ret);
         return ret;
     }
-    SrsTrace("st_init success");
+    SrsVerbose("st_init success");
 	
 	// set current log id.
 	log_context->SetId();
@@ -61,3 +75,129 @@ int SrsServer::initialize()
 	
 	return ret;
 }
+
+int SrsServer::start(int port)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
+        ret = ERROR_SOCKET_CREATE;
+        SrsError("create linux socket error. ret=%d", ret);
+        return ret;
+	}
+	SrsVerbose("create linux socket success. fd=%d", fd);
+    
+    int reuse_socket = 1;
+    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse_socket, sizeof(int)) == -1) {
+        ret = ERROR_SOCKET_SETREUSE;
+        SrsError("setsockopt reuse-addr error. ret=%d", ret);
+        return ret;
+    }
+    SrsVerbose("setsockopt reuse-addr success. fd=%d", fd);
+    
+    sockaddr_in addr;
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(port);
+    addr.sin_addr.s_addr = INADDR_ANY;
+    if (bind(fd, (const sockaddr*)&addr, sizeof(sockaddr_in)) == -1) {
+        ret = ERROR_SOCKET_BIND;
+        SrsError("bind socket error. ret=%d", ret);
+        return ret;
+    }
+    SrsVerbose("bind socket success. fd=%d", fd);
+    
+    if (listen(fd, SERVER_LISTEN_BACKLOG) == -1) {
+        ret = ERROR_SOCKET_LISTEN;
+        SrsError("listen socket error. ret=%d", ret);
+        return ret;
+    }
+    SrsVerbose("listen socket success. fd=%d", fd);
+    
+    if ((stfd = st_netfd_open_socket(fd)) == NULL){
+        ret = ERROR_ST_OPEN_SOCKET;
+        SrsError("st_netfd_open_socket open socket failed. ret=%d", ret);
+        return ret;
+    }
+    SrsVerbose("st open socket success. fd=%d", fd);
+    
+    if (st_thread_create(listen_thread, this, 0, 0) == NULL) {
+        ret = ERROR_ST_CREATE_LISTEN_THREAD;
+        SrsError("st_thread_create listen thread error. ret=%d", ret);
+        return ret;
+    }
+    SrsVerbose("create st listen thread success.");
+    
+    SrsTrace("server started, listen at port=%d, fd=%d", port, fd);
+	
+	return ret;
+}
+
+int SrsServer::cycle()
+{
+	int ret = ERROR_SUCCESS;
+	st_thread_exit(NULL);
+	return ret;
+}
+
+void SrsServer::remove(SrsConnection* conn)
+{
+	std::vector<SrsConnection*>::iterator it = std::find(conns.begin(), conns.end(), conn);
+	
+	if (it != conns.end()) {
+		conns.erase(it);
+	}
+	
+	// all connections are created by server,
+	// so we delete it here.
+	delete conn;
+}
+
+int SrsServer::accept_client(st_netfd_t client_stfd)
+{
+	int ret = ERROR_SUCCESS;
+	
+	SrsConnection* conn = new SrsConnection(this, client_stfd);
+	
+	// directly enqueue, the cycle thread will remove the client.
+	conns.push_back(conn);
+	
+	// cycle will start process thread and when finished remove the client.
+	if ((ret = conn->start()) != ERROR_SUCCESS) {
+		return ret;
+	}
+    
+	return ret;
+}
+
+void SrsServer::listen_cycle()
+{
+	int ret = ERROR_SUCCESS;
+	
+	while (true) {
+	    st_netfd_t client_stfd = st_accept(stfd, NULL, NULL, ST_UTIME_NO_TIMEOUT);
+	    
+	    if(client_stfd == NULL){
+	        // ignore error.
+	        SrsWarn("ignore accept thread stoppped for accept client error");
+	        continue;
+	    }
+    	
+    	if ((ret = accept_client(client_stfd)) != ERROR_SUCCESS) {
+    		SrsWarn("accept client error. ret=%d", ret);
+			continue;
+    	}
+    	
+    	SrsVerbose("accept client finished. ret=%d", ret);
+	}
+}
+
+void* SrsServer::listen_thread(void* arg)
+{
+	SrsServer* server = (SrsServer*)arg;
+	SrsAssert(server != NULL);
+	
+	server->listen_cycle();
+	
+	return NULL;
+}
+
diff --git a/trunk/src/core/srs_core_server.hpp b/trunk/src/core/srs_core_server.hpp
index 01af144e7..599775765 100755
--- a/trunk/src/core/srs_core_server.hpp
+++ b/trunk/src/core/srs_core_server.hpp
@@ -28,13 +28,31 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_server.hpp>
 */
 
+#include <srs_core.hpp>
+
+#include <vector>
+
+#include <st.h>
+
+class SrsConnection;
 class SrsServer
 {
+private:
+	int fd;
+	st_netfd_t stfd;
+	std::vector<SrsConnection*> conns;
 public:
 	SrsServer();
 	virtual ~SrsServer();
 public:
 	virtual int initialize();
+	virtual int start(int port);
+	virtual int cycle();
+	virtual void remove(SrsConnection* conn);
+private:
+	virtual int accept_client(st_netfd_t client_stfd);
+	virtual void listen_cycle();
+	static void* listen_thread(void* arg);
 };
 
 #endif
\ No newline at end of file
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 31c830940..548022706 100755
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -36,5 +36,13 @@ int main(int /*argc*/, char** /*argv*/){
 		return ret;
 	}
 	
+	if ((ret = server.start(19350)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	if ((ret = server.cycle()) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
     return 0;
 }
diff --git a/trunk/src/srs/srs.upp b/trunk/src/srs/srs.upp
index de51d1711..cd84fb5ac 100755
--- a/trunk/src/srs/srs.upp
+++ b/trunk/src/srs/srs.upp
@@ -8,6 +8,8 @@ file
     ..\core\srs_core_error.cpp,
     ..\core\srs_core_server.hpp,
     ..\core\srs_core_server.cpp,
+    ..\core\srs_core_conn.hpp,
+    ..\core\srs_core_conn.cpp,
     ..\core\srs_core_log.hpp,
     ..\core\srs_core_log.cpp;
 mainconfig