diff --git a/trunk/src/app/srs_app_http_stream.cpp b/trunk/src/app/srs_app_http_stream.cpp
index 99c22bc4e..943fdf3d3 100755
--- a/trunk/src/app/srs_app_http_stream.cpp
+++ b/trunk/src/app/srs_app_http_stream.cpp
@@ -606,7 +606,7 @@ srs_error_t SrsLiveStream::do_serve_http(ISrsHttpResponseWriter* w, ISrsHttpMess
     
     // update the statistic when source disconveried.
     SrsStatistic* stat = SrsStatistic::instance();
-    if ((err = stat->on_client(srs_int2str(_srs_context->get_id()), req, hc, SrsRtmpConnPlay)) != srs_success) {
+    if ((err = stat->on_client(_srs_context->get_id(), req, hc, SrsRtmpConnPlay)) != srs_success) {
         return srs_error_wrap(err, "stat on client");
     }
     
diff --git a/trunk/src/app/srs_app_rtc_api.cpp b/trunk/src/app/srs_app_rtc_api.cpp
index fd14b41d0..e1fa754ac 100644
--- a/trunk/src/app/srs_app_rtc_api.cpp
+++ b/trunk/src/app/srs_app_rtc_api.cpp
@@ -205,7 +205,7 @@ srs_error_t SrsGoApiRtcPlay::do_serve_http(ISrsHttpResponseWriter* w, ISrsHttpMe
     local_sdp_str = srs_string_replace(local_sdp_str.c_str(), "\r\n", "\\r\\n");
 
     res->set("code", SrsJsonAny::integer(ERROR_SUCCESS));
-    res->set("server", SrsJsonAny::integer(SrsStatistic::instance()->server_id()));
+    res->set("server", SrsJsonAny::str(SrsStatistic::instance()->server_id().c_str()));
 
     // TODO: add candidates in response json?
 
@@ -557,7 +557,7 @@ srs_error_t SrsGoApiRtcPublish::do_serve_http(ISrsHttpResponseWriter* w, ISrsHtt
     local_sdp_str = srs_string_replace(local_sdp_str.c_str(), "\r\n", "\\r\\n");
 
     res->set("code", SrsJsonAny::integer(ERROR_SUCCESS));
-    res->set("server", SrsJsonAny::integer(SrsStatistic::instance()->server_id()));
+    res->set("server", SrsJsonAny::str(SrsStatistic::instance()->server_id().c_str()));
 
     // TODO: add candidates in response json?
 
diff --git a/trunk/src/app/srs_app_rtmp_conn.cpp b/trunk/src/app/srs_app_rtmp_conn.cpp
index e298a18ae..e41b1ec47 100644
--- a/trunk/src/app/srs_app_rtmp_conn.cpp
+++ b/trunk/src/app/srs_app_rtmp_conn.cpp
@@ -533,7 +533,7 @@ srs_error_t SrsRtmpConn::stream_service_cycle()
     
     // update the statistic when source disconveried.
     SrsStatistic* stat = SrsStatistic::instance();
-    if ((err = stat->on_client(srs_int2str(_srs_context->get_id()), req, this, info->type)) != srs_success) {
+    if ((err = stat->on_client(_srs_context->get_id(), req, this, info->type)) != srs_success) {
         return srs_error_wrap(err, "rtmp: stat client");
     }
     
diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index 3c81319a8..3d317eb2d 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -2527,7 +2527,7 @@ srs_error_t SrsSource::on_publish()
     }
 
     SrsStatistic* stat = SrsStatistic::instance();
-    stat->on_stream_publish(req, srs_int2str(_source_id));
+    stat->on_stream_publish(req, _source_id);
     
     return err;
 }
diff --git a/trunk/src/app/srs_app_statistic.cpp b/trunk/src/app/srs_app_statistic.cpp
index 82757f5e1..9775d9ab8 100644
--- a/trunk/src/app/srs_app_statistic.cpp
+++ b/trunk/src/app/srs_app_statistic.cpp
@@ -47,7 +47,7 @@ string srs_generate_id()
 
 SrsStatisticVhost::SrsStatisticVhost()
 {
-    id = srs_int2str(srs_generate_id());
+    id = srs_generate_id();
     
     clk = new SrsWallClock();
     kbps = new SrsKbps(clk);
@@ -98,7 +98,7 @@ srs_error_t SrsStatisticVhost::dumps(SrsJsonObject* obj)
 
 SrsStatisticStream::SrsStatisticStream()
 {
-    id = srs_int2str(srs_generate_id());
+    id = srs_generate_id();
     vhost = NULL;
     active = false;