diff --git a/services/distributeddataservice/adapter/include/communicator/process_communicator_impl.h b/services/distributeddataservice/adapter/include/communicator/process_communicator_impl.h
index 9cf038113f6e3f3b2f5fc0539fa6a2a60e2a62d7..a4bee389d0228a0ec2ef47d1bf5fa44c27caf868 100755
--- a/services/distributeddataservice/adapter/include/communicator/process_communicator_impl.h
+++ b/services/distributeddataservice/adapter/include/communicator/process_communicator_impl.h
@@ -56,7 +56,7 @@ private:
     mutable std::mutex onDeviceChangeMutex_;
     mutable std::mutex onDataReceiveMutex_;
 
-    static constexpr uint32_t MTU_SIZE = 5242800; // the max transmission unit size(5MB - 80B)
+    static constexpr uint32_t MTU_SIZE = 4096; // the max transmission unit size(4K - 80B)
     static constexpr uint32_t MTU_SIZE_WATCH = 81920; // the max transmission unit size(80K)
     static constexpr const char *SMART_WATCH_TYPE = "SMART_WATCH";
     static constexpr const char *CHILDREN_WATCH_TYPE = "CHILDREN_WATCH";