diff --git a/trunk/src/app/srs_app_rtc_api.cpp b/trunk/src/app/srs_app_rtc_api.cpp
index 4a1bbfdf6..b52bd37e7 100644
--- a/trunk/src/app/srs_app_rtc_api.cpp
+++ b/trunk/src/app/srs_app_rtc_api.cpp
@@ -237,10 +237,8 @@ srs_error_t SrsGoApiRtcPlay::check_remote_sdp(const SrsSdp& remote_sdp)
             return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "now only suppor rtcp-mux");
         }
 
-        for (std::vector<SrsMediaPayloadType>::const_iterator iter_media = iter->payload_types_.begin(); iter_media != iter->payload_types_.end(); ++iter_media) {
-            if (iter->sendonly_) {
-                return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "play API only support sendrecv/recvonly");
-            }
+        if (iter->sendonly_) {
+            return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "play API only support sendrecv/recvonly");
         }
     }
 
@@ -489,10 +487,8 @@ srs_error_t SrsGoApiRtcPublish::check_remote_sdp(const SrsSdp& remote_sdp)
             return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "now only suppor rtcp-mux");
         }
 
-        for (std::vector<SrsMediaPayloadType>::const_iterator iter_media = iter->payload_types_.begin(); iter_media != iter->payload_types_.end(); ++iter_media) {
-            if (iter->recvonly_) {
-                return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "publish API only support sendrecv/sendonly");
-            }
+        if (iter->recvonly_) {
+            return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "publish API only support sendrecv/sendonly");
         }
     }