diff --git a/APP_Framework/Applications/control_app/plc_demo/siemens/README.md b/APP_Framework/Applications/control_app/plc_demo/siemens/README.md
index 444ecb54d..be90b92b8 100644
--- a/APP_Framework/Applications/control_app/plc_demo/siemens/README.md
+++ b/APP_Framework/Applications/control_app/plc_demo/siemens/README.md
@@ -6,7 +6,7 @@
 
 * 本体以太网口
 
-* FINS协议，PLC IP：192.168.250.2，Port：102
+* S7协议，PLC IP：192.168.250.2，Port：102
 
 ## 存储区