diff --git a/Assets/YooAsset/Runtime/AssetSystem/AssetSystem.cs b/Assets/YooAsset/Runtime/AssetSystem/AssetSystem.cs
index 40aeda1..f003613 100644
--- a/Assets/YooAsset/Runtime/AssetSystem/AssetSystem.cs
+++ b/Assets/YooAsset/Runtime/AssetSystem/AssetSystem.cs
@@ -20,7 +20,8 @@ namespace YooAsset
 		private bool _isUnloadSafe = true;
 		private string _packageName;
 		private bool _simulationOnEditor;
-		private int _loadingMaxNumber;
+		public int LoadingMaxNumber { private set; get; }
+		public int DownloadFailedTryAgain { private set; get; }
 		public IDecryptionServices DecryptionServices { private set; get; }
 		public IBundleServices BundleServices { private set; get; }
 
@@ -29,11 +30,13 @@ namespace YooAsset
 		/// 初始化
 		/// 注意：在使用AssetSystem之前需要初始化
 		/// </summary>
-		public void Initialize(string packageName, bool simulationOnEditor, int loadingMaxNumber, IDecryptionServices decryptionServices, IBundleServices bundleServices)
+		public void Initialize(string packageName, bool simulationOnEditor, int loadingMaxNumber, int downloadFailedTryAgain,
+			IDecryptionServices decryptionServices, IBundleServices bundleServices)
 		{
 			_packageName = packageName;
 			_simulationOnEditor = simulationOnEditor;
-			_loadingMaxNumber = loadingMaxNumber;
+			LoadingMaxNumber = loadingMaxNumber;
+			DownloadFailedTryAgain = downloadFailedTryAgain;
 			DecryptionServices = decryptionServices;
 			BundleServices = bundleServices;
 		}
@@ -63,7 +66,7 @@ namespace YooAsset
 				}
 				else
 				{
-					if (loadingCount < _loadingMaxNumber)
+					if (loadingCount < LoadingMaxNumber)
 						provider.Update();
 
 					if (provider.IsDone == false)
diff --git a/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleFileLoader.cs b/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleFileLoader.cs
index b113421..9de9906 100644
--- a/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleFileLoader.cs
+++ b/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleFileLoader.cs
@@ -81,7 +81,7 @@ namespace YooAsset
 			// 1. 从服务器下载
 			if (_steps == ESteps.Download)
 			{
-				int failedTryAgain = int.MaxValue;
+				int failedTryAgain = Impl.DownloadFailedTryAgain;
 				_downloader = DownloadSystem.BeginDownload(MainBundleInfo, failedTryAgain);
 				_steps = ESteps.CheckDownload;
 			}
diff --git a/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleWebLoader.cs b/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleWebLoader.cs
index 0b21ebd..f3fedb5 100644
--- a/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleWebLoader.cs
+++ b/Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleWebLoader.cs
@@ -70,7 +70,7 @@ namespace YooAsset
 			// 1. 从服务器下载
 			if (_steps == ESteps.Download)
 			{
-				int failedTryAgain = int.MaxValue;
+				int failedTryAgain = Impl.DownloadFailedTryAgain;
 				_downloader = DownloadSystem.BeginDownload(MainBundleInfo, failedTryAgain);
 				_steps = ESteps.CheckDownload;
 			}
diff --git a/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleFileLoader.cs b/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleFileLoader.cs
index 4aa615f..b7ee11a 100644
--- a/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleFileLoader.cs
+++ b/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleFileLoader.cs
@@ -63,7 +63,7 @@ namespace YooAsset
 			// 1. 下载远端文件
 			if (_steps == ESteps.Download)
 			{
-				int failedTryAgain = int.MaxValue;
+				int failedTryAgain = Impl.DownloadFailedTryAgain;
 				_downloader = DownloadSystem.BeginDownload(MainBundleInfo, failedTryAgain);
 				_steps = ESteps.CheckDownload;
 			}
diff --git a/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleWebLoader.cs b/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleWebLoader.cs
index c98565a..b5513d6 100644
--- a/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleWebLoader.cs
+++ b/Assets/YooAsset/Runtime/AssetSystem/Loader/RawBundleWebLoader.cs
@@ -61,7 +61,7 @@ namespace YooAsset
 			// 1. 下载远端文件
 			if (_steps == ESteps.Download)
 			{
-				int failedTryAgain = int.MaxValue;
+				int failedTryAgain = Impl.DownloadFailedTryAgain;
 				_downloader = DownloadSystem.BeginDownload(MainBundleInfo, failedTryAgain);
 				_steps = ESteps.CheckDownload;
 			}
diff --git a/Assets/YooAsset/Runtime/InitializeParameters.cs b/Assets/YooAsset/Runtime/InitializeParameters.cs
index d543ca0..077b78d 100644
--- a/Assets/YooAsset/Runtime/InitializeParameters.cs
+++ b/Assets/YooAsset/Runtime/InitializeParameters.cs
@@ -43,6 +43,11 @@ namespace YooAsset
 		/// 注意：默认值为MaxValue
 		/// </summary>
 		public int AssetLoadingMaxNumber = int.MaxValue;
+
+		/// <summary>
+		/// 下载失败尝试次数
+		/// </summary>
+		public int DownloadFailedTryAgain = int.MaxValue;
 	}
 
 	/// <summary>
diff --git a/Assets/YooAsset/Runtime/PatchSystem/ManifestTools.cs b/Assets/YooAsset/Runtime/PatchSystem/ManifestTools.cs
index 70ccc60..107bce9 100644
--- a/Assets/YooAsset/Runtime/PatchSystem/ManifestTools.cs
+++ b/Assets/YooAsset/Runtime/PatchSystem/ManifestTools.cs
@@ -74,6 +74,14 @@ namespace YooAsset
 			}
 		}
 
+		/// <summary>
+		/// 反序列化（JSON文件）
+		/// </summary>
+		public static PackageManifest DeserializeFromJson(string jsonContent)
+		{
+			return JsonUtility.FromJson<PackageManifest>(jsonContent);
+		}
+
 		/// <summary>
 		/// 反序列化（二进制文件）
 		/// </summary>
diff --git a/Assets/YooAsset/Runtime/ResourcePackage.cs b/Assets/YooAsset/Runtime/ResourcePackage.cs
index 8091bc3..879bdad 100644
--- a/Assets/YooAsset/Runtime/ResourcePackage.cs
+++ b/Assets/YooAsset/Runtime/ResourcePackage.cs
@@ -87,7 +87,9 @@ namespace YooAsset
 				var editorSimulateModeImpl = new EditorSimulateModeImpl();
 				_bundleServices = editorSimulateModeImpl;
 				_playModeServices = editorSimulateModeImpl;
-				_assetSystemImpl.Initialize(PackageName, true, parameters.AssetLoadingMaxNumber, parameters.DecryptionServices, _bundleServices);
+				_assetSystemImpl.Initialize(PackageName, true,
+					parameters.AssetLoadingMaxNumber, parameters.DownloadFailedTryAgain,
+					parameters.DecryptionServices, _bundleServices);
 
 				var initializeParameters = parameters as EditorSimulateModeParameters;
 				initializeOperation = editorSimulateModeImpl.InitializeAsync(initializeParameters.LocationToLower, initializeParameters.SimulateManifestFilePath);
@@ -97,7 +99,9 @@ namespace YooAsset
 				var offlinePlayModeImpl = new OfflinePlayModeImpl();
 				_bundleServices = offlinePlayModeImpl;
 				_playModeServices = offlinePlayModeImpl;
-				_assetSystemImpl.Initialize(PackageName, false, parameters.AssetLoadingMaxNumber, parameters.DecryptionServices, _bundleServices);
+				_assetSystemImpl.Initialize(PackageName, false,
+					parameters.AssetLoadingMaxNumber, parameters.DownloadFailedTryAgain,
+					parameters.DecryptionServices, _bundleServices);
 
 				var initializeParameters = parameters as OfflinePlayModeParameters;
 				initializeOperation = offlinePlayModeImpl.InitializeAsync(PackageName, initializeParameters.LocationToLower);
@@ -107,7 +111,9 @@ namespace YooAsset
 				var hostPlayModeImpl = new HostPlayModeImpl();
 				_bundleServices = hostPlayModeImpl;
 				_playModeServices = hostPlayModeImpl;
-				_assetSystemImpl.Initialize(PackageName, false, parameters.AssetLoadingMaxNumber, parameters.DecryptionServices, _bundleServices);
+				_assetSystemImpl.Initialize(PackageName, false,
+					parameters.AssetLoadingMaxNumber, parameters.DownloadFailedTryAgain,
+					parameters.DecryptionServices, _bundleServices);
 
 				var initializeParameters = parameters as HostPlayModeParameters;
 				initializeOperation = hostPlayModeImpl.InitializeAsync(
@@ -187,6 +193,11 @@ namespace YooAsset
 				parameters.AssetLoadingMaxNumber = 1;
 				YooLogger.Warning($"{nameof(parameters.AssetLoadingMaxNumber)} minimum value is 1");
 			}
+			if (parameters.DownloadFailedTryAgain < 1)
+			{
+				parameters.DownloadFailedTryAgain = 1;
+				YooLogger.Warning($"{nameof(parameters.DownloadFailedTryAgain)} minimum value is 1");
+			}
 		}
 		private void InitializeOperation_Completed(AsyncOperationBase op)
 		{
@@ -228,7 +239,7 @@ namespace YooAsset
 			DebugCheckInitialize();
 			return _playModeServices.PreDownloadContentAsync(packageVersion, timeout);
 		}
-		
+
 		/// <summary>
 		/// 清理包裹未使用的缓存文件
 		/// </summary>