diff --git a/README.md b/README.md
index 3bf5f90ac..83da9028c 100755
--- a/README.md
+++ b/README.md
@@ -176,6 +176,7 @@ The ports used by SRS:
 
 ## V4 changes
 
+* v4.0, 2021-05-09, Refine tid for sdk and demos. 4.0.106
 * v4.0, 2021-05-08, Refine shared fast timer. 4.0.105
 * v4.0, 2021-05-08, Refine global or thread-local variables initialize. 4.0.104
 * v4.0, 2021-05-07, RTC: Support circuit breaker. 4.0.103
diff --git a/trunk/3rdparty/signaling/www/demos/index.html b/trunk/3rdparty/signaling/www/demos/index.html
index 7774d6844..c2b617daa 100644
--- a/trunk/3rdparty/signaling/www/demos/index.html
+++ b/trunk/3rdparty/signaling/www/demos/index.html
@@ -15,7 +15,7 @@
     点击进入<a class="srs_demo" href="room.html?autostart=true">SRS多人通话演示</a>
 </p>
 <script>
-    let roomName = Number(new Date().getTime() + parseInt(String(Math.random() * 10000000000))).toString(16).substr(3);
+    let roomName = Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7);
     let elems = document.getElementsByClassName('srs_demo');
     for (var i = 0; i < elems.length; i++) {
         let elem = elems.item(i);
diff --git a/trunk/3rdparty/signaling/www/demos/js/srs.sdk.js b/trunk/3rdparty/signaling/www/demos/js/srs.sdk.js
index 4a80f23f0..4b030542d 100644
--- a/trunk/3rdparty/signaling/www/demos/js/srs.sdk.js
+++ b/trunk/3rdparty/signaling/www/demos/js/srs.sdk.js
@@ -144,7 +144,7 @@ function SrsRtcPublisherAsync() {
 
             return {
                 apiUrl: apiUrl, streamUrl: streamUrl, schema: schema, urlObject: urlObject, port: port,
-                tid: Number(new Date().getTime() + parseInt(String(Math.random() * 10000000000))).toString(16)
+                tid: Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7)
             };
         },
         parse: function (url) {
@@ -361,7 +361,7 @@ function SrsRtcPlayerAsync() {
 
             return {
                 apiUrl: apiUrl, streamUrl: streamUrl, schema: schema, urlObject: urlObject, port: port,
-                tid: Number(new Date().getTime() + parseInt(String(Math.random() * 10000000000))).toString(16)
+                tid: Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7)
             };
         },
         parse: function (url) {
diff --git a/trunk/3rdparty/signaling/www/demos/js/srs.sig.js b/trunk/3rdparty/signaling/www/demos/js/srs.sig.js
index bae95cc42..f2fef9a51 100644
--- a/trunk/3rdparty/signaling/www/demos/js/srs.sig.js
+++ b/trunk/3rdparty/signaling/www/demos/js/srs.sig.js
@@ -59,7 +59,7 @@ function SrsRtcSignalingAsync() {
     // The message is a json object.
     self.send = async function (message) {
         return new Promise(function (resolve, reject) {
-            var r = {tid: Number(new Date().getTime() + parseInt(String(Math.random() * 10000000000))).toString(16), msg: message};
+            var r = {tid: Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7), msg: message};
             self._internals.msgs[r.tid] = {resolve: resolve, reject: reject};
             self.ws.send(JSON.stringify(r));
         });
@@ -108,7 +108,7 @@ function SrsRtcSignalingParse(location) {
     room = room? room.split('&')[0] : null;
 
     let display = location.href.split('display=')[1];
-    display = display? display.split('&')[0] : Number(new Date().getTime() + parseInt(String(Math.random() * 10000000000))).toString(16).substr(3);
+    display = display? display.split('&')[0] : Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).toString(16).substr(0, 7);
 
     let autostart = location.href.split('autostart=')[1];
     autostart = autostart && autostart.split('&')[0] === 'true';
diff --git a/trunk/research/players/js/srs.sdk.js b/trunk/research/players/js/srs.sdk.js
index 03a77ad6d..4b030542d 100644
--- a/trunk/research/players/js/srs.sdk.js
+++ b/trunk/research/players/js/srs.sdk.js
@@ -144,7 +144,7 @@ function SrsRtcPublisherAsync() {
 
             return {
                 apiUrl: apiUrl, streamUrl: streamUrl, schema: schema, urlObject: urlObject, port: port,
-                tid: new Date().getTime().toString(16)
+                tid: Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7)
             };
         },
         parse: function (url) {
@@ -361,7 +361,7 @@ function SrsRtcPlayerAsync() {
 
             return {
                 apiUrl: apiUrl, streamUrl: streamUrl, schema: schema, urlObject: urlObject, port: port,
-                tid: new Date().getTime().toString(16)
+                tid: Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7)
             };
         },
         parse: function (url) {
diff --git a/trunk/research/players/srs_publisher_flash.html b/trunk/research/players/srs_publisher_flash.html
index 10094ec8e..f0f6dec37 100644
--- a/trunk/research/players/srs_publisher_flash.html
+++ b/trunk/research/players/srs_publisher_flash.html
@@ -335,7 +335,7 @@
         $("#btn_publish").click(on_user_publish);
 
         // for publish, we use randome stream name.
-        $("#txt_url").val($("#txt_url").val() + "." + Number(new Date().getTime() + parseInt(String(Math.random() * 10000000000))).toString(16));
+        $("#txt_url").val($("#txt_url").val() + "." + Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).substr(0, 7));
 
         // start the publisher.
         srs_publisher = new SrsPublisher("local_publisher", 430, 185);
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 511b1fcad..ac03a6dd1 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -26,6 +26,6 @@
 
 #define VERSION_MAJOR       4
 #define VERSION_MINOR       0
-#define VERSION_REVISION    105
+#define VERSION_REVISION    106
 
 #endif