diff --git a/src/Extension/H265.cpp b/src/Extension/H265.cpp
index 23177030..e2967567 100644
--- a/src/Extension/H265.cpp
+++ b/src/Extension/H265.cpp
@@ -51,7 +51,7 @@ bool getHEVCInfo(const string &strVps, const string &strSps, int &iVideoWidth, i
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 bool H265Frame::keyFrame() const {
-    return isKeyFrame(H265_TYPE(_buffer[_prefix_size]), _buffer.data(), _prefix_size);
+    return isKeyFrame(H265_TYPE(_buffer[_prefix_size]), _buffer.data() + _prefix_size);
 }
 
 bool H265Frame::configFrame() const {
@@ -63,22 +63,12 @@ bool H265Frame::configFrame() const {
     }
 }
 
-bool H265Frame::isKeyFrame(int type, const char* ptr, uint32_t prefix_size) {
-        if (nullptr != ptr)
-        {
-            if (type == NAL_IDR_W_RADL)
-            {
-                uint32_t r = 0;
-                r = ((*((uint8_t*)ptr + prefix_size + 2)) >> 7) & 0x01;
-                if (r == 1)
-                    return true;
-                else
-                    return false;
-            }else
-                return type >= NAL_BLA_W_LP && type <= NAL_RSV_IRAP_VCL23;
-        }
+bool H265Frame::isKeyFrame(int type, const char *ptr) {
+    if (!ptr || type != NAL_IDR_W_RADL) {
         return type >= NAL_BLA_W_LP && type <= NAL_RSV_IRAP_VCL23;
     }
+    return (((*((uint8_t *) ptr + 2)) >> 7) & 0x01) == 1;
+}
 
 H265Frame::H265Frame(){
     _codec_id = CodecH265;
@@ -96,7 +86,7 @@ H265FrameNoCacheAble::H265FrameNoCacheAble(char *ptr, size_t size, uint32_t dts,
 }
 
 bool H265FrameNoCacheAble::keyFrame() const {
-	return H265Frame::isKeyFrame(H265_TYPE(((uint8_t *) _ptr)[_prefix_size]), _ptr, _prefix_size);
+    return H265Frame::isKeyFrame(H265_TYPE(((uint8_t *) _ptr)[_prefix_size]), _ptr + _prefix_size);
 }
 
 bool H265FrameNoCacheAble::configFrame() const {
@@ -165,13 +155,12 @@ void H265Track::inputFrame(const Frame::Ptr &frame) {
 
 void H265Track::inputFrame_l(const Frame::Ptr &frame) {
     int type = H265_TYPE(((uint8_t *) frame->data() + frame->prefixSize())[0]);
-    if (H265Frame::isKeyFrame(type, frame->data(), frame->prefixSize())) {
+    if (H265Frame::isKeyFrame(type, frame->data() + frame->prefixSize())) {
         insertConfigFrame(frame);
         VideoTrack::inputFrame(frame);
         _is_idr = true;
         return;
     }
-
     _is_idr = false;
 
     //非idr帧
diff --git a/src/Extension/H265.h b/src/Extension/H265.h
index 2d1fad49..fe24df3f 100644
--- a/src/Extension/H265.h
+++ b/src/Extension/H265.h
@@ -61,7 +61,7 @@ public:
 
     bool keyFrame() const override;
     bool configFrame() const override;
-    static bool isKeyFrame(int type, const char* ptr, uint32_t prefix_size);
+    static bool isKeyFrame(int type, const char* ptr);
 
 protected:
     friend class FrameImp;
diff --git a/src/Extension/H265Rtp.cpp b/src/Extension/H265Rtp.cpp
index 0a947a98..c3079313 100644
--- a/src/Extension/H265Rtp.cpp
+++ b/src/Extension/H265Rtp.cpp
@@ -269,7 +269,7 @@ void H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
                 //H265 数据
                 memcpy(payload + 3, ptr + offset, max_size);
                 //输入到rtp环形缓存
-                RtpCodec::inputRtp(rtp, fu_start && H265Frame::isKeyFrame(nal_type, frame->data(), frame->prefixSize()));
+                RtpCodec::inputRtp(rtp, fu_start && H265Frame::isKeyFrame(nal_type, frame->data() + frame->prefixSize()));
             }
 
             offset += max_size;
@@ -281,7 +281,7 @@ void H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
 }
 
 void H265RtpEncoder::makeH265Rtp(int nal_type,const void* data, size_t len, bool mark, bool first_packet, uint32_t uiStamp) {
-    RtpCodec::inputRtp(makeRtp(getTrackType(),data,len,mark,uiStamp),first_packet && H265Frame::isKeyFrame(nal_type, (const char*)data, prefixSize((const char*)data, len)));
+    RtpCodec::inputRtp(makeRtp(getTrackType(),data,len,mark,uiStamp),first_packet && H265Frame::isKeyFrame(nal_type, (const char*)data + prefixSize((const char*)data, len)));
 }
 
 }//namespace mediakit