diff --git a/trunk/configure b/trunk/configure
index 78b7b869e..6f6d4950e 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -124,7 +124,7 @@ fi
 #Core Module
 MODULE_ID="CORE" 
 MODULE_DEPENDS=() 
-ModuleLibIncs=(${LibSTRoot} ${SRS_OBJS})
+ModuleLibIncs=(${SRS_OBJS})
 MODULE_FILES=("srs_core")
 MODULE_DIR="src/core" . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
@@ -141,7 +141,8 @@ MODULE_FILES=("srs_core_log" "srs_core_server"
         "srs_core_handshake" "srs_core_pithy_print"
         "srs_core_config" "srs_core_refer" "srs_core_reload"
         "srs_core_hls" "srs_core_forward" "srs_core_encoder"
-        "srs_core_http" "srs_core_thread" "srs_core_bandwidth")
+        "srs_core_http" "srs_core_thread" "srs_core_bandwidth"
+        "srs_core_st")
 MODULE_DIR="src/app" . auto/modules.sh
 APP_OBJS="${MODULE_OBJS[@]}"
 #
diff --git a/trunk/src/app/srs_core_bandwidth.hpp b/trunk/src/app/srs_core_bandwidth.hpp
index 0f375bdc5..967f73897 100644
--- a/trunk/src/app/srs_core_bandwidth.hpp
+++ b/trunk/src/app/srs_core_bandwidth.hpp
@@ -29,6 +29,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 #include <srs_core.hpp>
 
+#include <srs_core_st.hpp>
+
 class SrsRequest;
 class SrsRtmp;
 
diff --git a/trunk/src/app/srs_core_client.hpp b/trunk/src/app/srs_core_client.hpp
index fe1d1475e..e7a16f82a 100644
--- a/trunk/src/app/srs_core_client.hpp
+++ b/trunk/src/app/srs_core_client.hpp
@@ -30,6 +30,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core.hpp>
 
+#include <srs_core_st.hpp>
 #include <srs_core_conn.hpp>
 #include <srs_core_reload.hpp>
 
diff --git a/trunk/src/app/srs_core_conn.hpp b/trunk/src/app/srs_core_conn.hpp
index 8ac78f8d3..b520f8e68 100644
--- a/trunk/src/app/srs_core_conn.hpp
+++ b/trunk/src/app/srs_core_conn.hpp
@@ -30,6 +30,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core.hpp>
 
+#include <srs_core_st.hpp>
+
 class SrsServer;
 class SrsConnection
 {
diff --git a/trunk/src/app/srs_core_forward.hpp b/trunk/src/app/srs_core_forward.hpp
index 34bfbfb95..afc1217af 100644
--- a/trunk/src/app/srs_core_forward.hpp
+++ b/trunk/src/app/srs_core_forward.hpp
@@ -31,6 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <string>
 
+#include <srs_core_st.hpp>
 #include <srs_core_thread.hpp>
 
 class SrsSharedPtrMessage;
diff --git a/trunk/src/app/srs_core_http.hpp b/trunk/src/app/srs_core_http.hpp
index 67a05088d..c7250d430 100644
--- a/trunk/src/app/srs_core_http.hpp
+++ b/trunk/src/app/srs_core_http.hpp
@@ -29,6 +29,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 #include <srs_core.hpp>
 
+#include <srs_core_st.hpp>
+
 #ifdef SRS_HTTP
 
 class SrsRequest;
diff --git a/trunk/src/app/srs_core_log.cpp b/trunk/src/app/srs_core_log.cpp
index 64f0c9294..d072dcda0 100644
--- a/trunk/src/app/srs_core_log.cpp
+++ b/trunk/src/app/srs_core_log.cpp
@@ -29,6 +29,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <string>
 #include <map>
 
+#include <st.h>
+
 ILogContext::ILogContext()
 {
 }
diff --git a/trunk/src/app/srs_core_protocol.hpp b/trunk/src/app/srs_core_protocol.hpp
index f7735be55..cc79f10f2 100644
--- a/trunk/src/app/srs_core_protocol.hpp
+++ b/trunk/src/app/srs_core_protocol.hpp
@@ -33,6 +33,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <map>
 #include <string>
 
+#include <srs_core_st.hpp>
 #include <srs_core_log.hpp>
 #include <srs_core_error.hpp>
 
diff --git a/trunk/src/app/srs_core_rtmp.hpp b/trunk/src/app/srs_core_rtmp.hpp
index bd39e550a..8c79661ca 100644
--- a/trunk/src/app/srs_core_rtmp.hpp
+++ b/trunk/src/app/srs_core_rtmp.hpp
@@ -32,6 +32,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <string>
 
+#include <srs_core_st.hpp>
+
 class SrsProtocol;
 class ISrsMessage;
 class SrsCommonMessage;
diff --git a/trunk/src/app/srs_core_server.hpp b/trunk/src/app/srs_core_server.hpp
index 13599b465..0e588ef1c 100644
--- a/trunk/src/app/srs_core_server.hpp
+++ b/trunk/src/app/srs_core_server.hpp
@@ -32,6 +32,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <vector>
 
+#include <srs_core_st.hpp>
 #include <srs_core_reload.hpp>
 #include <srs_core_thread.hpp>
 
diff --git a/trunk/src/app/srs_core_socket.hpp b/trunk/src/app/srs_core_socket.hpp
index 8b25c39dd..f027287b4 100644
--- a/trunk/src/app/srs_core_socket.hpp
+++ b/trunk/src/app/srs_core_socket.hpp
@@ -30,6 +30,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core.hpp>
 
+#include <srs_core_st.hpp>
+
 /**
 * the socket provides TCP socket over st,
 * that is, the sync socket mechanism.
diff --git a/trunk/src/app/srs_core_source.hpp b/trunk/src/app/srs_core_source.hpp
index 3f8d62796..e280af9ee 100644
--- a/trunk/src/app/srs_core_source.hpp
+++ b/trunk/src/app/srs_core_source.hpp
@@ -34,6 +34,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <vector>
 #include <string>
 
+#include <srs_core_st.hpp>
 #include <srs_core_reload.hpp>
 
 class SrsSource;
diff --git a/trunk/src/app/srs_core_st.cpp b/trunk/src/app/srs_core_st.cpp
new file mode 100644
index 000000000..761d56791
--- /dev/null
+++ b/trunk/src/app/srs_core_st.cpp
@@ -0,0 +1,37 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 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_st.hpp>
+
+void srs_close_stfd(st_netfd_t& stfd)
+{
+	if (stfd) {
+		int fd = st_netfd_fileno(stfd);
+		st_netfd_close(stfd);
+		stfd = NULL;
+		
+		// st does not close it sometimes, 
+		// close it manually.
+		close(fd);
+	}
+}
diff --git a/trunk/src/app/srs_core_st.hpp b/trunk/src/app/srs_core_st.hpp
new file mode 100644
index 000000000..473586b59
--- /dev/null
+++ b/trunk/src/app/srs_core_st.hpp
@@ -0,0 +1,38 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 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_ST_HPP
+#define SRS_CORE_ST_HPP
+
+/*
+#include <srs_core_st.hpp>
+*/
+
+#include <srs_core.hpp>
+
+#include <st.h>
+
+// close the netfd, and close the underlayer fd.
+extern void srs_close_stfd(st_netfd_t& stfd);
+
+#endif
diff --git a/trunk/src/app/srs_core_thread.hpp b/trunk/src/app/srs_core_thread.hpp
index 3210dcb56..0db59f68b 100644
--- a/trunk/src/app/srs_core_thread.hpp
+++ b/trunk/src/app/srs_core_thread.hpp
@@ -29,6 +29,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 #include <srs_core.hpp>
 
+#include <srs_core_st.hpp>
+
 /**
 * the handler for the thread, callback interface.
 * the thread model defines as:
diff --git a/trunk/src/core/srs_core.cpp b/trunk/src/core/srs_core.cpp
index 4d2cfbf66..1099e346e 100644
--- a/trunk/src/core/srs_core.cpp
+++ b/trunk/src/core/srs_core.cpp
@@ -109,16 +109,3 @@ void srs_vhost_resolve(std::string& vhost, std::string& app)
 	}
 }
 
-void srs_close_stfd(st_netfd_t& stfd)
-{
-	if (stfd) {
-		int fd = st_netfd_fileno(stfd);
-		st_netfd_close(stfd);
-		stfd = NULL;
-		
-		// st does not close it sometimes, 
-		// close it manually.
-		close(fd);
-	}
-}
-
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 08409c2e3..c76ae5007 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -46,8 +46,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <stddef.h>
 #include <sys/types.h>
 
-#include <st.h>
-
 // generated by configure.
 #include <srs_auto_headers.hpp>
 
@@ -104,9 +102,6 @@ extern std::string srs_dns_resolve(std::string host);
 //		app...vhost...request_vhost
 extern void srs_vhost_resolve(std::string& vhost, std::string& app);
 
-// close the netfd, and close the underlayer fd.
-extern void srs_close_stfd(st_netfd_t& stfd);
-
 /**
 * disable copy constructor of class
 */
diff --git a/trunk/src/srs/srs.upp b/trunk/src/srs/srs.upp
index 860556546..e61b00d6f 100755
--- a/trunk/src/srs/srs.upp
+++ b/trunk/src/srs/srs.upp
@@ -52,6 +52,8 @@ file
     ..\app\srs_core_thread.cpp,
     ..\app\srs_core_server.hpp,
     ..\app\srs_core_server.cpp,
+    ..\app\srs_core_st.hpp,
+    ..\app\srs_core_st.cpp,
     ..\app\srs_core_stream.hpp,
     ..\app\srs_core_stream.cpp,
     ..\app\srs_core_socket.hpp,