diff --git a/services/audiomanager/managersink/include/daudio_sink_manager.h b/services/audiomanager/managersink/include/daudio_sink_manager.h
index 07a4e73469f6dd8dfe0f0e5cbee9dcd9aea46c3d..51e22c4f5e7357bdf5ee7bde303d048001c25b7d 100644
--- a/services/audiomanager/managersink/include/daudio_sink_manager.h
+++ b/services/audiomanager/managersink/include/daudio_sink_manager.h
@@ -79,6 +79,7 @@ private:
 
 private:
     static constexpr const char* DEVCLEAR_THREAD = "sinkClearTh";
+    static constexpr uint32_t MAX_SOURCE_SERVICE_NUM = 256;
     std::mutex devMapMutex_;
     std::unordered_map<std::string, std::shared_ptr<DAudioSinkDev>> audioDevMap_;
     std::mutex remoteSvrMutex_;
diff --git a/services/audiomanager/managersink/src/daudio_sink_manager.cpp b/services/audiomanager/managersink/src/daudio_sink_manager.cpp
index 99d7aeead4f4ce6fe50322eb38ab9b680a30b715..90c2536f5e57ccb3f876f6d03002f4c854f23692 100644
--- a/services/audiomanager/managersink/src/daudio_sink_manager.cpp
+++ b/services/audiomanager/managersink/src/daudio_sink_manager.cpp
@@ -266,6 +266,10 @@ int32_t DAudioSinkManager::DAudioNotify(const std::string &devId, const std::str
     CHECK_NULL_RETURN(remoteSvrProxy, ERR_DH_AUDIO_NULLPTR);
     {
         std::lock_guard<std::mutex> lck(remoteSvrMutex_);
+        if (sourceServiceMap_.size() > MAX_SOURCE_SERVICE_NUM) {
+            DHLOGE("Service map is full.");
+            return ERR_DH_AUDIO_FAILED;
+        }
         sourceServiceMap_[devId] = remoteSvrProxy;
         remoteSvrProxy->DAudioNotify(localNetworkId_, dhId, eventType, eventContent);
     }
diff --git a/services/audiomanager/managersource/include/daudio_source_manager.h b/services/audiomanager/managersource/include/daudio_source_manager.h
index c0cf00bfe68d0bf3933889c325cdef89701924bf..639a250beef5e84ddc26aa3c91b4db1265cd8844 100644
--- a/services/audiomanager/managersource/include/daudio_source_manager.h
+++ b/services/audiomanager/managersource/include/daudio_source_manager.h
@@ -79,6 +79,7 @@ private:
     static constexpr int32_t WATCHDOG_DELAY_TIME = 5000;
     static constexpr size_t SLEEP_TIME = 1000000;
     static constexpr size_t WAIT_HANDLER_IDLE_TIME_US = 10000;
+    static constexpr uint32_t MAX_SINK_SERVICE_NUM = 256;
 
     std::string localDevId_;
     std::mutex devMapMtx_;
diff --git a/services/audiomanager/managersource/src/daudio_source_manager.cpp b/services/audiomanager/managersource/src/daudio_source_manager.cpp
index f84878aced3918ff96091cb07eef5141b006f764..5c7c0d4ec60bfd85d32ca6f3d0ffa274fb221cae 100644
--- a/services/audiomanager/managersource/src/daudio_source_manager.cpp
+++ b/services/audiomanager/managersource/src/daudio_source_manager.cpp
@@ -340,6 +340,10 @@ int32_t DAudioSourceManager::DAudioNotify(const std::string &devId, const std::s
     CHECK_NULL_RETURN(remoteSvrProxy, ERR_DH_AUDIO_NULLPTR);
     {
         std::lock_guard<std::mutex> lck(remoteSvrMutex_);
+        if (sinkServiceMap_.size() > MAX_SINK_SERVICE_NUM) {
+            DHLOGE("Service map is full.");
+            return ERR_DH_AUDIO_FAILED;
+        }
         sinkServiceMap_[devId] = remoteSvrProxy;
         remoteSvrProxy->DAudioNotify(localDevId_, dhId, eventType, eventContent);
     }