diff --git a/Assets/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs b/Assets/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs
index 64d59e86..cb621a75 100644
--- a/Assets/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs
+++ b/Assets/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs
@@ -228,7 +228,18 @@ namespace YooAsset
                 DebugUpdateRecording();
 
                 // 更新任务
-                InternalUpdate();
+                // 注意：兜底隔离机制
+                // 说明：检测的异常源包含：I/O（解压/读写权限/磁盘满），平台差异等
+                try
+                {
+                    InternalUpdate();
+                }
+                catch (Exception ex)
+                {
+                    Status = EOperationStatus.Failed;
+                    Error = ex.ToString();
+                    YooLogger.Error($"Exception in {this.GetType().Name}.InternalUpdate : {ex}");
+                }
             }
 
             if (IsDone && IsFinish == false)
@@ -353,7 +364,6 @@ namespace YooAsset
         public void WaitForAsyncComplete()
         {
             //TODO 防止异步操作被挂起陷入无限死循环！
-            // 例如：文件解压任务或者文件导入任务！
             if (Status == EOperationStatus.None)
             {
                 StartOperation();
diff --git a/Assets/YooAsset/Runtime/OperationSystem/OperationSystem.cs b/Assets/YooAsset/Runtime/OperationSystem/OperationSystem.cs
index 876c4aba..e72de0df 100644
--- a/Assets/YooAsset/Runtime/OperationSystem/OperationSystem.cs
+++ b/Assets/YooAsset/Runtime/OperationSystem/OperationSystem.cs
@@ -5,7 +5,7 @@ using System.Diagnostics;
 
 namespace YooAsset
 {
-    internal class OperationSystem
+    internal static class OperationSystem
     {
 #if UNITY_EDITOR
         [UnityEngine.RuntimeInitializeOnLoadMethod(UnityEngine.RuntimeInitializeLoadType.SubsystemRegistration)]
@@ -57,11 +57,14 @@ namespace YooAsset
         /// </summary>
         public static void Initialize()
         {
-            _isInitialize = true;
-            _watch = Stopwatch.StartNew();
+            if (_isInitialize == false)
+            {
+                _isInitialize = true;
+                _watch = Stopwatch.StartNew();
 
-            // 创建全局调度器
-            CreatePackageScheduler(GLOBAL_SCHEDULER_NAME, 0);
+                // 创建全局调度器
+                CreatePackageScheduler(GLOBAL_SCHEDULER_NAME, int.MaxValue);
+            }
         }
 
         /// <summary>
@@ -97,6 +100,7 @@ namespace YooAsset
         /// </summary>
         public static void DestroyAll()
         {
+            _isInitialize = false;
             YooLogger.Log("Operation system destroy all !");
 
             // 清空所有调度器
@@ -108,7 +112,6 @@ namespace YooAsset
             _schedulerList.Clear();
             _schedulerListDirty = false;
             _createIndex = 0;
-            _isInitialize = false;
 
             _watch = null;
             _frameTime = 0;
@@ -120,6 +123,8 @@ namespace YooAsset
         /// </summary>
         public static void CreatePackageScheduler(string packageName, int priority)
         {
+            DebugCheckInitialize(packageName);
+
             if (_schedulerDic.ContainsKey(packageName))
             {
                 throw new YooInternalException($"Package scheduler already exists: {packageName}");
@@ -136,6 +141,8 @@ namespace YooAsset
         /// </summary>
         public static void DestroyPackageScheduler(string packageName)
         {
+            DebugCheckInitialize(packageName);
+
             // 不允许销毁默认调度器
             if (packageName == GLOBAL_SCHEDULER_NAME)
             {
@@ -155,6 +162,8 @@ namespace YooAsset
         /// </summary>
         public static void ClearPackageOperation(string packageName)
         {
+            DebugCheckInitialize(packageName);
+
             var scheduler = GetScheduler(packageName);
             scheduler.ClearAll();
         }
@@ -164,6 +173,8 @@ namespace YooAsset
         /// </summary>
         public static void StartOperation(string packageName, AsyncOperationBase operation)
         {
+            DebugCheckInitialize(packageName);
+
             var scheduler = GetScheduler(packageName);
             scheduler.StartOperation(operation);
         }
@@ -179,15 +190,29 @@ namespace YooAsset
             }
 
             // 严格模式：非默认包裹必须先创建调度器
-            throw new YooInternalException($"Operation scheduler not found: {packageName}. Please call YooAssets.CreatePackage() first!");
+            throw new YooInternalException($"Operation scheduler not found: {packageName}.");
         }
 
         #region 调试信息
         internal static List<DebugOperationInfo> GetDebugOperationInfos(string packageName)
         {
+            DebugCheckInitialize(packageName);
+
             var scheduler = GetScheduler(packageName);
             return scheduler.GetDebugOperationInfos();
         }
         #endregion
+
+        #region 调试方法
+        [Conditional("DEBUG")]
+        private static void DebugCheckInitialize(string packageName)
+        {
+            if (string.IsNullOrWhiteSpace(packageName))
+                throw new YooInternalException("Package name is null or empty.");
+
+            if (_isInitialize == false)
+                throw new YooInternalException($"{nameof(OperationSystem)} not initialized !");
+        }
+        #endregion
     }
 }
diff --git a/Assets/YooAsset/Runtime/OperationSystem/README.md b/Assets/YooAsset/Runtime/OperationSystem/README.md
index 128659b4..5cd39d31 100644
--- a/Assets/YooAsset/Runtime/OperationSystem/README.md
+++ b/Assets/YooAsset/Runtime/OperationSystem/README.md
@@ -227,16 +227,16 @@ public static void StartOperation(string packageName, AsyncOperationBase operati
 
 #### 回调监听
 
-```csharp
-/// <summary>
-/// 注册任务开始回调
-/// </summary>
-public static void RegisterStartCallback(Action<string, AsyncOperationBase> callback);
+OperationSystem **当前未提供**全局任务开始/结束回调的注册接口。
 
-/// <summary>
-/// 注册任务结束回调
-/// </summary>
-public static void RegisterFinishCallback(Action<string, AsyncOperationBase> callback);
+如需监听任务结束（推荐），请直接订阅具体任务的 `Completed` 事件：
+
+```csharp
+var operation = package.LoadAssetAsync<GameObject>(location);
+operation.Completed += op =>
+{
+    // TODO : 根据 op.Status 判断成功/失败
+};
 ```
 
 ---
@@ -515,4 +515,4 @@ IEnumerator + IComparable<AsyncOperationBase>
 4. **子任务中止**：父操作中止时会自动中止所有子操作
 5. **回调异常**：`Completed` 回调中的异常会被捕获并记录，不会中断系统
 6. **编辑器重置**：编辑器中使用 `RuntimeInitializeOnLoadMethod` 自动重置状态
-7. **循环保护**：在 `InternalWaitForAsyncComplete()` 中如果使用 `ExecuteWhileDone()`，内部默认有 1000 次执行保护，防止无限循环
+7. **循环保护**：在 `InternalWaitForAsyncComplete()` 中建议使用 `RunBatchExecution()`（默认 1000 次）限制单次推进次数，避免陷入无限循环或长时间占用主线程