diff --git a/Assets/YooAsset/Editor/AssetBundleBuilder/AssetBundleBuilderWindow.cs b/Assets/YooAsset/Editor/AssetBundleBuilder/AssetBundleBuilderWindow.cs
index 0a9f831..a8fe46e 100644
--- a/Assets/YooAsset/Editor/AssetBundleBuilder/AssetBundleBuilderWindow.cs
+++ b/Assets/YooAsset/Editor/AssetBundleBuilder/AssetBundleBuilderWindow.cs
@@ -199,9 +199,7 @@ namespace YooAsset.Editor
 		}
 		private List<Type> GetEncryptionServicesClassTypes()
 		{
-			TypeCache.TypeCollection collection = TypeCache.GetTypesDerivedFrom<IEncryptionServices>();
-			List<Type> classTypes = collection.ToList();
-			return classTypes;
+			return EditorTools.GetAssignableTypes(typeof(IEncryptionServices));
 		}
 		private IEncryptionServices CreateEncryptionServicesInstance()
 		{
diff --git a/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollectorSettingData.cs b/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollectorSettingData.cs
index 6b7707d..96ecea2 100644
--- a/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollectorSettingData.cs
+++ b/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollectorSettingData.cs
@@ -139,8 +139,7 @@ namespace YooAsset.Editor
 					typeof(PackRawFile),
 				};
 
-				TypeCache.TypeCollection collection = TypeCache.GetTypesDerivedFrom<IPackRule>();
-				var customTypes = collection.ToList();
+				var customTypes = EditorTools.GetAssignableTypes(typeof(IPackRule));
 				types.AddRange(customTypes);
 				for (int i = 0; i < types.Count; i++)
 				{
@@ -165,8 +164,7 @@ namespace YooAsset.Editor
 					typeof(CollectSprite)
 				};
 
-				TypeCache.TypeCollection collection = TypeCache.GetTypesDerivedFrom<IFilterRule>();
-				var customTypes = collection.ToList();
+				var customTypes = EditorTools.GetAssignableTypes(typeof(IFilterRule));
 				types.AddRange(customTypes);
 				for (int i = 0; i < types.Count; i++)
 				{
@@ -190,8 +188,7 @@ namespace YooAsset.Editor
 					typeof(AddressByGroupAndFileName)
 				};
 
-				TypeCache.TypeCollection collection = TypeCache.GetTypesDerivedFrom<IAddressRule>();
-				var customTypes = collection.ToList();
+				var customTypes = EditorTools.GetAssignableTypes(typeof(IAddressRule));
 				types.AddRange(customTypes);
 				for (int i = 0; i < types.Count; i++)
 				{
diff --git a/Assets/YooAsset/Editor/EditorDefine.cs b/Assets/YooAsset/Editor/EditorDefine.cs
index 10a5654..202a49f 100644
--- a/Assets/YooAsset/Editor/EditorDefine.cs
+++ b/Assets/YooAsset/Editor/EditorDefine.cs
@@ -4,10 +4,12 @@ namespace YooAsset.Editor
 {
 	public class EditorDefine
 	{
+#if UNITY_2019_4_OR_NEWER
 		/// <summary>
 		/// 停靠窗口类型集合
 		/// </summary>
 		public static readonly Type[] DockedWindowTypes = { typeof(AssetBundleBuilderWindow), typeof(AssetBundleCollectorWindow), typeof(AssetBundleDebuggerWindow), typeof(AssetBundleReporterWindow)};
+#endif
 	}
 
 	/// <summary>
diff --git a/Assets/YooAsset/Editor/EditorTools.cs b/Assets/YooAsset/Editor/EditorTools.cs
index dd9cd39..dfb004a 100644
--- a/Assets/YooAsset/Editor/EditorTools.cs
+++ b/Assets/YooAsset/Editor/EditorTools.cs
@@ -1,10 +1,10 @@
-using System.Collections;
+using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Reflection;
 using System.Linq;
 using System.IO;
 using System.Text;
-using System.Text.RegularExpressions;
 using UnityEngine;
 using UnityEditor;
 
@@ -15,7 +15,57 @@ namespace YooAsset.Editor
 	/// </summary>
 	public static class EditorTools
 	{
+		static EditorTools()
+		{
+			InitAssembly();
+		}
+
 		#region Assembly
+#if UNITY_2019_4_OR_NEWER
+		private static void InitAssembly()
+		{
+		}
+
+		/// <summary>
+		/// 获取带继承关系的所有类的类型
+		/// </summary>
+		public static List<Type> GetAssignableTypes(System.Type parentType)
+		{
+			TypeCache.TypeCollection collection = TypeCache.GetTypesDerivedFrom(parentType);
+			return collection.ToList();
+		}
+#else
+		private static readonly List<Type> _cacheTypes = new List<Type>(10000);
+		private static void InitAssembly()
+		{
+			Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
+			foreach (Assembly assembly in assemblies)
+			{
+				List<Type> types = assembly.GetTypes().ToList();
+				_cacheTypes.AddRange(types);
+			}
+		}
+
+		/// <summary>
+		/// 获取带继承关系的所有类的类型
+		/// </summary>
+		public static List<Type> GetAssignableTypes(System.Type parentType)
+		{
+			List<Type> result = new List<Type>();
+			for (int i = 0; i < _cacheTypes.Count; i++)
+			{
+				Type type = _cacheTypes[i];
+				if (parentType.IsAssignableFrom(type))
+				{
+					if (type.Name == parentType.Name)
+						continue;
+					result.Add(type);
+				}
+			}
+			return result;
+		}
+#endif
+
 		/// <summary>
 		/// 调用私有的静态方法
 		/// </summary>
@@ -190,7 +240,7 @@ namespace YooAsset.Editor
 		}
 		#endregion
 
-		#region 控制台
+		#region EditorConsole
 		private static MethodInfo _clearConsoleMethod;
 		private static MethodInfo ClearConsoleMethod
 		{
@@ -551,40 +601,6 @@ namespace YooAsset.Editor
 			}
 			return string.Empty;
 		}
-		#endregion
-
-		#region 字符串
-		/// <summary>
-		/// 是否含有中文
-		/// </summary>
-		public static bool IncludeChinese(string content)
-		{
-			foreach (var c in content)
-			{
-				if (c >= 0x4e00 && c <= 0x9fbb)
-					return true;
-			}
-			return false;
-		}
-
-		/// <summary>
-		/// 是否是数字
-		/// </summary>
-		public static bool IsNumber(string content)
-		{
-			if (string.IsNullOrEmpty(content))
-				return false;
-			string pattern = @"^\d*$";
-			return Regex.IsMatch(content, pattern);
-		}
-
-		/// <summary>
-		/// 首字母大写
-		/// </summary>
-		public static string Capitalize(string content)
-		{
-			return content.Substring(0, 1).ToUpper() + (content.Length > 1 ? content.Substring(1).ToLower() : "");
-		}
 
 		/// <summary>
 		/// 截取字符串
@@ -594,7 +610,7 @@ namespace YooAsset.Editor
 		/// <param name="key">关键字</param>
 		/// <param name="includeKey">分割的结果里是否包含关键字</param>
 		/// <param name="searchBegin">是否使用初始匹配的位置，否则使用末尾匹配的位置</param>
-		public static string Substring(string content, string key, bool includeKey, bool firstMatch = true)
+		private static string Substring(string content, string key, bool includeKey, bool firstMatch = true)
 		{
 			if (string.IsNullOrEmpty(key))
 				return content;
@@ -614,6 +630,7 @@ namespace YooAsset.Editor
 			else
 				return content.Substring(startIndex + key.Length);
 		}
+
 		#endregion
 	}
 }
\ No newline at end of file
diff --git a/Assets/YooAsset/Runtime/YooAssets.cs b/Assets/YooAsset/Runtime/YooAssets.cs
index cc83d60..ee13c2b 100644
--- a/Assets/YooAsset/Runtime/YooAssets.cs
+++ b/Assets/YooAsset/Runtime/YooAssets.cs
@@ -15,7 +15,7 @@ namespace YooAsset
 		{
 			/// <summary>
 			/// 编辑器下的模拟模式
-			/// 注意：在初始化的时候自动构建真机运行环境。
+			/// 注意：在初始化的时候自动构建真机模拟环境。
 			/// </summary>
 			EditorSimulateMode,
 			
@@ -122,7 +122,7 @@ namespace YooAsset
 				_locationServices = parameters.LocationServices;
 
 #if !UNITY_EDITOR
-			if (parameters is EditorPlayModeParameters)
+			if (parameters is EditorSimulateModeParameters)
 				throw new Exception($"Editor play mode only support unity editor.");
 #endif