diff --git a/include/CCommon.h b/include/CCommon.h
index a765184c5..391b28946 100644
--- a/include/CCommon.h
+++ b/include/CCommon.h
@@ -45,7 +45,9 @@ typedef enum _CStatus_ {
   PULLCONSUMER_ERROR_CODE_START = 30,
   PULLCONSUMER_START_FAILED = 30,
   PULLCONSUMER_FETCH_MQ_FAILED = 31,
-  PULLCONSUMER_FETCH_MESSAGE_FAILED = 32
+  PULLCONSUMER_FETCH_MESSAGE_FAILED = 32,
+
+  Not_Support = 500
 } CStatus;
 
 typedef enum _CLogLevel_ {
diff --git a/include/CPushConsumer.h b/include/CPushConsumer.h
index 10b55873b..0369a807f 100644
--- a/include/CPushConsumer.h
+++ b/include/CPushConsumer.h
@@ -18,8 +18,8 @@
 #ifndef __C_PUSH_CONSUMER_H__
 #define __C_PUSH_CONSUMER_H__
 
-#include "CMessageExt.h"
 #include "CCommon.h"
+#include "CMessageExt.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -56,6 +56,8 @@ ROCKETMQCLIENT_API int SetPushConsumerLogPath(CPushConsumer* consumer, const cha
 ROCKETMQCLIENT_API int SetPushConsumerLogFileNumAndSize(CPushConsumer* consumer, int fileNum, long fileSize);
 ROCKETMQCLIENT_API int SetPushConsumerLogLevel(CPushConsumer* consumer, CLogLevel level);
 ROCKETMQCLIENT_API int SetPushConsumerMessageModel(CPushConsumer* consumer, CMessageModel messageModel);
+ROCKETMQCLIENT_API int SetPushConsumerMaxCacheMessageSize(CPushConsumer* consumer, int maxCacheSize);
+ROCKETMQCLIENT_API int SetPushConsumerMaxCacheMessageSizeInMb(CPushConsumer* consumer, int maxCacheSizeInMb);
 
 #ifdef __cplusplus
 };
diff --git a/src/extern/CPushConsumer.cpp b/src/extern/CPushConsumer.cpp
index 621eabde7..66ef93757 100644
--- a/src/extern/CPushConsumer.cpp
+++ b/src/extern/CPushConsumer.cpp
@@ -229,7 +229,20 @@ int SetPushConsumerMessageBatchMaxSize(CPushConsumer* consumer, int batchSize) {
   ((DefaultMQPushConsumer*)consumer)->setConsumeMessageBatchMaxSize(batchSize);
   return OK;
 }
+int SetPushConsumerMaxCacheMessageSize(CPushConsumer* consumer, int maxCacheSize) {
+  if (consumer == NULL || maxCacheSize <= 0) {
+    return NULL_POINTER;
+  }
+  ((DefaultMQPushConsumer*)consumer)->setMaxCacheMsgSizePerQueue(maxCacheSize);
+  return OK;
+}
 
+int SetPushConsumerMaxCacheMessageSizeInMb(CPushConsumer* consumer, int maxCacheSizeInMb) {
+  if (consumer == NULL || maxCacheSizeInMb <= 0) {
+    return NULL_POINTER;
+  }
+  return Not_Support;
+}
 int SetPushConsumerInstanceName(CPushConsumer* consumer, const char* instanceName) {
   if (consumer == NULL) {
     return NULL_POINTER;