diff --git a/update.bat b/update.bat
index 54ad55d..0126efc 100644
--- a/update.bat
+++ b/update.bat
@@ -8,7 +8,6 @@ dir>%LOG_PATH%
 echo ---->>%LOG_PATH%
 
 ::test dir
-echo %~dp0
 cd ..
 cd ..
 if not exist "Blueprint" (
@@ -41,7 +40,7 @@ goto end_with_error
 )
 
 ::test .git/
-%GIT_PATH% rev-parse --is-inside-work-tree>>%LOG_PATH%
+%GIT_PATH% rev-parse --resolve-git-dir "%~dp0.git"
 if %errorlevel% NEQ 0 (
 echo 错误：.git/已损坏
 echo %date% %time% Error: .git/ is broken>>%LOG_PATH%