diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index be3279250..000000000
--- a/.gitmodules
+++ /dev/null
@@ -1,4 +0,0 @@
-
-[submodule "cmd/Open-IM-SDK-Core"]
-	path = cmd/Open-IM-SDK-Core
-	url = https://github.com/OpenIMSDK/Open-IM-SDK-Core.git
diff --git a/install_guide.sh b/install_guide.sh
index 57fad73dd..1c5f06fb9 100644
--- a/install_guide.sh
+++ b/install_guide.sh
@@ -43,7 +43,7 @@ edit_config() {
       vi config/config.yaml
     ;;
     2)
-      echo "do not edit config"    
+      echo "do not edit config"
     ;;
     esac
 }
@@ -174,4 +174,3 @@ case $choice in
     echo "Invalid option, please try again."
     ;;
 esac
-