diff --git a/scripts/ci/run_unit_tests.sh b/scripts/ci/run_unit_tests.sh
index 9a94d51c0..1da6aa34b 100755
--- a/scripts/ci/run_unit_tests.sh
+++ b/scripts/ci/run_unit_tests.sh
@@ -76,7 +76,8 @@ if [ "${GITHUB_EVENT_NAME:-}" = "pull_request" ] && [ -n "${GITHUB_TOKEN:-}" ];
 
   PR_CODE_DIR="/tmp/pr-code-$$"
   mkdir -p "$PR_CODE_DIR"
-  find . -maxdepth 1 -mindepth 1 ! -name 'coverage.xml' ! -name 'diff_coverage.html' -exec cp -r {} "$PR_CODE_DIR/" \;
+  # 备份PR代码（含coverage.xml，diff-cover需要用到
+  find . -maxdepth 1 -mindepth 1 ! -name 'diff_coverage.html' -exec cp -r {} "$PR_CODE_DIR/" \;
   rm -rf .git
   git init > /dev/null 2>&1
   git remote add origin https://git.xiaoxiajianji.com/xiaoxia/xiaoxia-saas.git > /dev/null 2>&1