diff --git a/README.md b/README.md
index 4f340b6c2..87fda461f 100755
--- a/README.md
+++ b/README.md
@@ -155,6 +155,7 @@ For previous versions, please read:
 
 ## V4 changes
 
+* v4.0, 2021-02-08, RTC: Print stat for pli and timer every 5s. 4.0.70
 * v4.0, 2021-02-07, RTC: Parse PT fast and refine udp handler. 4.0.69
 * v4.0, 2021-02-05, RTC: Refine UDP packet peer fast id. 4.0.68
 * v4.0, 2021-02-04, RTC: Reuse UDP socket to receive packet. 4.0.67
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 1bdfecf96..96c1d53a3 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -949,9 +949,9 @@ srs_error_t SrsRtcPublishStream::initialize(SrsRequest* r, SrsRtcStreamDescripti
 
     nack_enabled_ = _srs_config->get_rtc_nack_enabled(req->vhost);
     pt_to_drop_ = (uint16_t)_srs_config->get_rtc_drop_for_pt(req->vhost);
-    bool twcc_enabled = _srs_config->get_rtc_twcc_enabled(req->vhost);
+    twcc_enabled_ = _srs_config->get_rtc_twcc_enabled(req->vhost);
 
-    srs_trace("RTC publisher nack=%d, pt-drop=%u, twcc=%u/%d", nack_enabled_, pt_to_drop_, twcc_enabled, twcc_id);
+    srs_trace("RTC publisher nack=%d, pt-drop=%u, twcc=%u/%d", nack_enabled_, pt_to_drop_, twcc_enabled_, twcc_id);
 
     session_->stat_->nn_publishers++;
 
@@ -1231,6 +1231,10 @@ srs_error_t SrsRtcPublishStream::check_send_nacks()
 {
     srs_error_t err = srs_success;
 
+    if (!nack_enabled_) {
+        return err;
+    }
+
     for (int i = 0; i < (int)video_tracks_.size(); ++i) {
         SrsRtcVideoRecvTrack* track = video_tracks_.at(i);
         if ((err = track->check_send_nacks()) != srs_success) {
@@ -1441,7 +1445,7 @@ srs_error_t SrsRtcPublishStream::notify(int type, srs_utime_t interval, srs_utim
         }
     }
 
-    if (type == SRS_TICKID_TWCC) {
+    if (twcc_enabled_ && type == SRS_TICKID_TWCC) {
         // We should not depends on the received packet,
         // instead we should send feedback every Nms.
         if ((err = send_periodic_twcc()) != srs_success) {
diff --git a/trunk/src/app/srs_app_rtc_conn.hpp b/trunk/src/app/srs_app_rtc_conn.hpp
index fadee0059..6ea20b701 100644
--- a/trunk/src/app/srs_app_rtc_conn.hpp
+++ b/trunk/src/app/srs_app_rtc_conn.hpp
@@ -319,6 +319,7 @@ private:
     uint16_t pt_to_drop_;
     // Whether enabled nack.
     bool nack_enabled_;
+    bool twcc_enabled_;
 private:
     bool request_keyframe_;
     SrsErrorPithyPrint* pli_epp;
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index b349db047..21c702cbb 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -24,6 +24,6 @@
 #ifndef SRS_CORE_VERSION4_HPP
 #define SRS_CORE_VERSION4_HPP
 
-#define SRS_VERSION4_REVISION 69
+#define SRS_VERSION4_REVISION 70
 
 #endif