diff --git a/display_server/frameworks/surface/src/native_window.cpp b/display_server/frameworks/surface/src/native_window.cpp
index f50228f136f752b88da79501a36f0c58eec51044..039be9aad4d89bfb0d0baef191ccf706e5a407ba 100644
--- a/display_server/frameworks/surface/src/native_window.cpp
+++ b/display_server/frameworks/surface/src/native_window.cpp
@@ -128,7 +128,12 @@ int32_t NativeWindowFlushBuffer(OHNativeWindow *window, OHNativeWindowBuffer *bu
 
     OHOS::sptr<OHOS::SyncFence> acquireFence = new OHOS::SyncFence(fenceFd);
     window->surface->FlushBuffer(buffer->sfbuffer, acquireFence, config);
-
+    // fixbug: fd leak. 
+    buffer->sfbuffer = nullptr;
+    // here we delete OHNativeWindowBuffer buffer, because we new it when requesting.
+    // otherwise, will leak mem of OHNativeWindowBuffer per frame.
+    // actually, if we delete buffer, fd will not leak fd at the sametime.
+    delete buffer;
     return OHOS::GSERROR_OK;
 }