diff --git a/apps/ScreenShareApi/src/main/kotlin/Routing.kt b/apps/ScreenShareApi/src/main/kotlin/Routing.kt
index 7ff9288..c606441 100644
--- a/apps/ScreenShareApi/src/main/kotlin/Routing.kt
+++ b/apps/ScreenShareApi/src/main/kotlin/Routing.kt
@@ -151,16 +151,17 @@ fun Application.configureRouting() {
                 val membership = RoomRepository.member(room.id, user.id)
                     ?: throw ApiException("请先加入房间", 403)
                 val liveKit = liveKitSettings()
+                val participantIdentity = user.id.toString() + "-" + UUID.randomUUID()
                 val token = LiveKitTokenIssuer(liveKit.apiKey, liveKit.apiSecret).issue(
                     roomName = room.id.toString(),
-                    identity = user.id.toString(),
+                    identity = participantIdentity,
                     participantName = user.displayName,
                     role = membership.role,
                 )
                 call.respond(
                     TokenResponse(
                         roomName = room.id.toString(),
-                        participantIdentity = user.id.toString(),
+                        participantIdentity = participantIdentity,
                         participantName = user.displayName,
                         livekitUrl = liveKit.publicUrl,
                         token = token,