diff --git a/gb28181-wvp-proxy-service/src/main/java/cn/skcks/docking/gb28181/wvp/service/gb28181/Gb28181DownloadService.java b/gb28181-wvp-proxy-service/src/main/java/cn/skcks/docking/gb28181/wvp/service/gb28181/Gb28181DownloadService.java
index b099d9b..6bff4e7 100644
--- a/gb28181-wvp-proxy-service/src/main/java/cn/skcks/docking/gb28181/wvp/service/gb28181/Gb28181DownloadService.java
+++ b/gb28181-wvp-proxy-service/src/main/java/cn/skcks/docking/gb28181/wvp/service/gb28181/Gb28181DownloadService.java
@@ -30,6 +30,7 @@ import cn.skcks.docking.gb28181.wvp.sip.subscribe.SipSubscribe;
 import gov.nist.javax.sdp.MediaDescriptionImpl;
 import gov.nist.javax.sdp.fields.AttributeField;
 import gov.nist.javax.sdp.fields.TimeField;
+import gov.nist.javax.sdp.fields.URIField;
 import gov.nist.javax.sip.message.SIPResponse;
 import lombok.RequiredArgsConstructor;
 import lombok.SneakyThrows;
@@ -133,11 +134,14 @@ public class Gb28181DownloadService {
         timeField.setStartTime(start);
         timeField.setStopTime(end);
         TimeDescription timeDescription = SdpFactory.getInstance().createTimeDescription(timeField);
-        GB28181Description gb28181Description = MediaSdpHelper.playback(gbDeviceId, channel, Connection.IP4, ip, port, ssrc, StreamMode.of(ListeningPoint.UDP), startTime, endTime);
+        GB28181Description gb28181Description = MediaSdpHelper.build(MediaSdpHelper.Action.DOWNLOAD, gbDeviceId, channel, Connection.IP4, ip, port, ssrc, StreamMode.of(ListeningPoint.UDP), timeDescription);
         gb28181Description.setSessionName(SdpFactory.getInstance().createSessionName(MediaSdpHelper.Action.DOWNLOAD.getAction()));
         gb28181Description.setTimeDescriptions(new Vector<>(){{add(timeDescription);}});
         MediaDescriptionImpl media = (MediaDescriptionImpl) gb28181Description.getMediaDescriptions(true).get(0);
         media.setAttribute("downloadspeed", String.valueOf(4));
+        URIField uriField = new URIField();
+        uriField.setURI(StringUtils.joinWith(":", channel, "0"));
+        gb28181Description.setURI(uriField);
         sender.sendRequest(inviteRequest(docking, device, gb28181Description, MediaSdpHelper.Action.DOWNLOAD, ssrc, streamId, result, time));
         return result;
     }