diff --git a/action.yml b/action.yml
index 1314855..ee1a9c8 100644
--- a/action.yml
+++ b/action.yml
@@ -7,12 +7,31 @@ inputs:
     default: '80'
 runs:
   using: 'composite'
+  env:
+    DISK_USAGE_THRESHOLD: ${{ inputs.DISK_USAGE_THRESHOLD }}
   steps:
   - name: 取得磁碟使用率
     id: disk
     run: |
-      USAGE=$(df / | awk 'NR==2{print $5}' | tr -d '%')
-      echo "磁碟使用率：${USAGE}%"
+      echo "=================================================="
+
+      echo "參數檢查"
+
+      echo "--------------------------------------------------"
+
+      # 顯示 DISK_USAGE_THRESHOLD 參數，並檢查是否為空或 "null"，如果是則輸出錯誤訊息並退出
+      echo "DISK_USAGE_THRESHOLD=$DISK_USAGE_THRESHOLD" && ([ -z "$DISK_USAGE_THRESHOLD" ] || [ "$DISK_USAGE_THRESHOLD" = "null" ]) && DISK_USAGE_THRESHOLD='80'
+
+      echo "=================================================="
+
+      echo "取得硬碟使用率"
+
+      echo "--------------------------------------------------"
+
+      # 取得硬碟使用率
+      USAGE=$(df / | awk 'NR==2{print $5}' | tr -d '%') && echo "磁碟使用率：${USAGE}%"
+
+      # 檢查是否需要清理 Docker 資源
       if [ "$USAGE" -gt "$DISK_USAGE_THRESHOLD" ]; then
         echo "should_prune=true" >> $GITHUB_OUTPUT
       else