diff --git a/zh-cn/device-dev/driver/driver-platform-uart-develop.md b/zh-cn/device-dev/driver/driver-platform-uart-develop.md
index b0c410be520e08c8f7551afbb25d54de9c1b229a..82f50bc23b2af3e0fa920b2aeb9865b25c90c398 100755
--- a/zh-cn/device-dev/driver/driver-platform-uart-develop.md
+++ b/zh-cn/device-dev/driver/driver-platform-uart-develop.md
@@ -535,10 +535,10 @@ UART模块适配HDF框架的三个环节是配置属性文件，实例化驱动
                 if (port->physBase != 0) {
                     OsalIoUnmap((void *)port->physBase);//地址反映射
                 }
-                (void)OsalMemFree(port);
+                OsalMemFree(port);
                 udd->private = NULL;
             }
-            (void)OsalMemFree(udd);//释放UartDriverData
+            OsalMemFree(udd);//释放UartDriverData
             host->priv = NULL;
         }
         ```