diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/session/VideoStreamSessionManager.java b/src/main/java/com/genersoft/iot/vmp/gb28181/session/VideoStreamSessionManager.java
index c69faf96..65e1e5f6 100644
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/session/VideoStreamSessionManager.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/session/VideoStreamSessionManager.java
@@ -15,6 +15,7 @@ import org.springframework.stereotype.Component;
 public class VideoStreamSessionManager {
 
 	private ConcurrentHashMap<String, ClientTransaction> sessionMap = new ConcurrentHashMap<>();
+	private ConcurrentHashMap<String, String> ssrcMap = new ConcurrentHashMap<>();
 
 	public String createPlaySsrc(){
 		return SsrcUtil.getPlaySsrc();
@@ -24,16 +25,18 @@ public class VideoStreamSessionManager {
 		return SsrcUtil.getPlayBackSsrc();
 	}
 	
-	public void put(String ssrc,ClientTransaction transaction){
-		sessionMap.put(ssrc, transaction);
+	public void put(String streamId,String ssrc,ClientTransaction transaction){
+		sessionMap.put(streamId, transaction);
+		ssrcMap.put(streamId, ssrc);
 	}
 	
-	public ClientTransaction get(String ssrc){
-		return sessionMap.get(ssrc);
+	public ClientTransaction get(String streamId){
+		return sessionMap.get(streamId);
 	}
 	
-	public void remove(String ssrc) {
-		sessionMap.remove(ssrc);
-		SsrcUtil.releaseSsrc(ssrc);
+	public void remove(String streamId) {
+		sessionMap.remove(streamId);
+		SsrcUtil.releaseSsrc(ssrcMap.get(streamId));
+		ssrcMap.remove(streamId);
 	}
 }
diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
index 6bab8090..6561763b 100644
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
@@ -388,7 +388,7 @@ public class SIPCommander implements ISIPCommander {
 			Request request = headerProvider.createInviteRequest(device, channelId, content.toString(), null, "FromInvt" + tm, null, ssrc);
 
 			ClientTransaction transaction = transmitRequest(device, request, errorEvent);
-			streamSession.put(streamId, transaction);
+			streamSession.put(streamId,ssrc, transaction);
 
 
 
@@ -488,7 +488,7 @@ public class SIPCommander implements ISIPCommander {
 	        Request request = headerProvider.createPlaybackInviteRequest(device, channelId, content.toString(), null, "fromplybck" + tm, null);
 
 	        ClientTransaction transaction = transmitRequest(device, request, errorEvent);
-	        streamSession.put(streamId, transaction);
+	        streamSession.put(streamId, ssrc, transaction);
 
 		} catch ( SipException | ParseException | InvalidArgumentException e) {
 			e.printStackTrace();
diff --git a/web_src/.postcssrc.js b/web_src/.postcssrc.js
index 406b4d24..f8737a12 100644
--- a/web_src/.postcssrc.js
+++ b/web_src/.postcssrc.js
@@ -7,7 +7,7 @@ module.exports = {
     // to edit target browsers: use "browserslist" field in package.json
     "autoprefixer": {},
     'postcss-pxtorem': {
-      rootValue: 24, 
+      rootValue: 16,
       propList: ['font-size'] // 只转化font-size
     }
   }