diff --git a/trunk/src/app/srs_app_utility.cpp b/trunk/src/app/srs_app_utility.cpp
index faba0f788..2c5e9f595 100644
--- a/trunk/src/app/srs_app_utility.cpp
+++ b/trunk/src/app/srs_app_utility.cpp
@@ -22,3 +22,23 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 #include <srs_app_utility.hpp>
+
+#include <srs_kernel_log.hpp>
+#include <srs_app_config.hpp>
+
+int srs_get_log_level(std::string level)
+{
+    if ("verbose" == _srs_config->get_srs_log_level()) {
+        return SrsLogLevel::Verbose;
+    } else if ("info" == _srs_config->get_srs_log_level()) {
+        return SrsLogLevel::Info;
+    } else if ("trace" == _srs_config->get_srs_log_level()) {
+        return SrsLogLevel::Trace;
+    } else if ("warn" == _srs_config->get_srs_log_level()) {
+        return SrsLogLevel::Warn;
+    } else if ("error" == _srs_config->get_srs_log_level()) {
+        return SrsLogLevel::Error;
+    } else {
+        return SrsLogLevel::Trace;
+    }
+}
diff --git a/trunk/src/app/srs_app_utility.hpp b/trunk/src/app/srs_app_utility.hpp
index 990a52673..155ddcec4 100644
--- a/trunk/src/app/srs_app_utility.hpp
+++ b/trunk/src/app/srs_app_utility.hpp
@@ -30,4 +30,10 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core.hpp>
 
+/**
+* convert level in string to log level in int.
+* @return the log level defined in SrsLogLevel.
+*/
+extern int srs_get_log_level(std::string level);
+
 #endif
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 6c0960541..05d8b18e3 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -164,19 +164,7 @@ int main(int argc, char** argv)
     }
     
     // config parsed, initialize log.
-    if ("verbose" == _srs_config->get_srs_log_level()) {
-        _srs_log->set_level(SrsLogLevel::Verbose);
-    } else if ("info" == _srs_config->get_srs_log_level()) {
-        _srs_log->set_level(SrsLogLevel::Info);
-    } else if ("trace" == _srs_config->get_srs_log_level()) {
-        _srs_log->set_level(SrsLogLevel::Trace);
-    } else if ("warn" == _srs_config->get_srs_log_level()) {
-        _srs_log->set_level(SrsLogLevel::Warn);
-    } else if ("error" == _srs_config->get_srs_log_level()) {
-        _srs_log->set_level(SrsLogLevel::Error);
-    } else {
-        _srs_log->set_level(SrsLogLevel::Trace);
-    }
+    _srs_log->set_level(srs_get_log_level(_srs_config->get_srs_log_level()));
     
     srs_trace("srs(simple-rtmp-server) "RTMP_SIG_SRS_VERSION);
     srs_trace("uname: "SRS_UNAME);