diff --git a/Src/Asp.Net/SqlSugar/Infrastructure/DependencyManagement.cs b/Src/Asp.Net/SqlSugar/Infrastructure/DependencyManagement.cs
index a54bfc6c6..2888c2310 100644
--- a/Src/Asp.Net/SqlSugar/Infrastructure/DependencyManagement.cs
+++ b/Src/Asp.Net/SqlSugar/Infrastructure/DependencyManagement.cs
@@ -1,10 +1,8 @@
-using MySql.Data.MySqlClient;
-using Newtonsoft.Json;
-using System;
+using System;
 using System.Collections.Generic;
 using System.Data.SqlClient;
-using System.Data.SQLite;
 using System.Linq;
+using System.Reflection;
 using System.Text;
 namespace SqlSugar
 {
@@ -19,34 +17,35 @@ namespace SqlSugar
             {
                 try
                 {
-                    var settings =JsonConvert.DefaultSettings;
+                    Assembly asmb = Assembly.LoadFrom("Newtonsoft.Json.dll");
+                    asmb = CheckAssembly(asmb);
                     IsTryJsonNet = true;
                 }
-                catch (Exception ex)
+                catch
                 {
-                   var message= ErrorMessage.GetThrowMessage(
-                       " Some functions are used in newtonsoft ,Nuget references newtonsoft.json, 9.0.0.1 + ."+ex.Message,
-                       " 部分功能用到newtonsoft，Nuget上面下载安装 newtonsoft.json, 9.0.0.1及以上版本，如果有版本兼容问题请先删除原有引用，详细错误："+ex.Message);
-                    Check.ThrowNotSupportedException(message);
+                    var message = ErrorMessage.GetThrowMessage(
+                        " Some functions are used in newtonsoft ,Nuget references Newtonsoft.Json 9.0.0.1 + .",
+                        " 部分功能用到Newtonsoft.Json.dll，需要在Nuget上安装 Newtonsoft.Json 9.0.0.1及以上版本，如果有版本兼容问题请先删除原有引用");
+                    throw new Exception(message);
                 }
             }
         }
-
         public static void TryMySqlData()
         {
             if (!IsTryMySqlData)
             {
                 try
                 {
-                    using (MySqlConnection mySql = new MySqlConnection()){}
+                    Assembly asmb = Assembly.LoadFrom("MySql.Data.dll");
+                    asmb = CheckAssembly(asmb);
                     IsTryMySqlData = true;
                 }
-                catch (Exception ex)
+                catch 
                 {
                     var message = ErrorMessage.GetThrowMessage(
-                     "You need to refer to MySql.Data.dll"+ex.Message,
-                     "需要MySql.Data.dll请在Nuget安装最新版本，如果有版本兼容问题请先删除原有引用，详细错误：" + ex.Message);
-                    Check.ThrowNotSupportedException(message);
+                     "You need to refer to MySql.Data.dll" ,
+                     "需要引用MySql.Data.dll，请在Nuget安装最新稳定版本,如果有版本兼容问题请先删除原有引用");
+                    throw new Exception(message);
                 }
             }
         }
@@ -57,17 +56,26 @@ namespace SqlSugar
             {
                 try
                 {
-                    using (SQLiteConnection mySql = new SQLiteConnection()) { }
+                    Assembly asmb = Assembly.LoadFrom("System.Data.SQLite.dll");
+                    asmb = CheckAssembly(asmb);
                     IsTrySqlite = true;
                 }
                 catch (Exception ex)
                 {
                     var message = ErrorMessage.GetThrowMessage(
-                     ex.Message,
-                    "需要Sqlite相关的驱动，如果有版本兼容问题请先删除原有引用，如果有版本兼容问题请先删除原有引用，详细错误：" + ex.Message);
-                    Check.ThrowNotSupportedException(message);
+                     "You need to refer to System.Data.SQLite.dll",
+                    "你需要引用System.Data.SQLite.dll,如果有版本兼容问题请先删除原有引用");
+                    throw new Exception(message);
                 }
             }
         }
+
+        private static Assembly CheckAssembly(Assembly asmb)
+        {
+            if (asmb == null) throw new Exception("");
+            asmb = null;
+            return asmb;
+        }
+
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs b/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs
index db3d42196..5bf962ab6 100644
--- a/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs
+++ b/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs
@@ -281,7 +281,7 @@ namespace SqlSugar
             var result = (Restult)Activator.CreateInstance(type, true);
             return result;
         }
-        private static T CreateInstance<T>(string className)
+        public static T CreateInstance<T>(string className)
         {
             Type type;
             if (typeCache.ContainsKey(className))
diff --git a/Src/Asp.Net/SqlSugar/Infrastructure/RewritableMethods.cs b/Src/Asp.Net/SqlSugar/Infrastructure/RewritableMethods.cs
index d8e71dc03..9df038461 100644
--- a/Src/Asp.Net/SqlSugar/Infrastructure/RewritableMethods.cs
+++ b/Src/Asp.Net/SqlSugar/Infrastructure/RewritableMethods.cs
@@ -6,7 +6,6 @@ using System.Linq;
 using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
-using Newtonsoft.Json;
 namespace SqlSugar
 {
     public class RewritableMethods : IRewritableMethods
@@ -192,9 +191,11 @@ namespace SqlSugar
         public string SerializeObject(object value)
         {
             DependencyManagement.TryJsonNet();
-            return JsonConvert.SerializeObject(value);
+            return JsonHelper.SerializeObject(value);
         }
 
+   
+
         /// <summary>
         /// Serialize Object
         /// </summary>
@@ -203,8 +204,7 @@ namespace SqlSugar
         public T DeserializeObject<T>(string value)
         {
             DependencyManagement.TryJsonNet();
-            var jSetting = new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore };
-            return JsonConvert.DeserializeObject<T>(value, jSetting);
+            return JsonHelper.DeserializeObject<T>(value);
         }
         #endregion
 
@@ -257,7 +257,7 @@ namespace SqlSugar
                 }
                 deserializeObject.Add(childRow);
             }
-            return JsonConvert.DeserializeObject<dynamic>(JsonConvert.SerializeObject(deserializeObject));
+            return this.DeserializeObject<dynamic>(this.SerializeObject(deserializeObject));
 
         }
         #endregion
diff --git a/Src/Asp.Net/SqlSugar/Properties/AssemblyInfo.cs b/Src/Asp.Net/SqlSugar/Properties/AssemblyInfo.cs
index b3e9483d2..31f15d041 100644
--- a/Src/Asp.Net/SqlSugar/Properties/AssemblyInfo.cs
+++ b/Src/Asp.Net/SqlSugar/Properties/AssemblyInfo.cs
@@ -31,5 +31,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("4.5.1.7")]
-[assembly: AssemblyFileVersion("4.5.1.7")]
+[assembly: AssemblyVersion("4.5.1.8")]
+[assembly: AssemblyFileVersion("4.5.1.8")]
diff --git a/Src/Asp.Net/SqlSugar/SqlSugar.csproj b/Src/Asp.Net/SqlSugar/SqlSugar.csproj
index 34d197161..947634899 100644
--- a/Src/Asp.Net/SqlSugar/SqlSugar.csproj
+++ b/Src/Asp.Net/SqlSugar/SqlSugar.csproj
@@ -73,6 +73,7 @@
     <Compile Include="Abstract\DeleteProvider\DeleteableProvider.cs" />
     <Compile Include="Enum\DbType.cs" />
     <Compile Include="Infrastructure\DependencyManagement.cs" />
+    <Compile Include="Utilities\JsonHelper.cs" />
     <Compile Include="Utilities\ReflectionExtensions.cs" />
     <Compile Include="Realization\MySql\CodeFirst\MySqlCodeFirst.cs" />
     <Compile Include="Realization\MySql\DbFirst\MySqlDbFirst.cs" />
diff --git a/Src/Asp.Net/SqlSugar/SqlSugarClient.cs b/Src/Asp.Net/SqlSugar/SqlSugarClient.cs
index b22aa27b1..d039201cd 100644
--- a/Src/Asp.Net/SqlSugar/SqlSugarClient.cs
+++ b/Src/Asp.Net/SqlSugar/SqlSugarClient.cs
@@ -22,6 +22,7 @@ namespace SqlSugar
         {
             base.Context = this;
             base.CurrentConnectionConfig = config;
+            Check.ArgumentNullException(config, "config is null");
             switch (config.DbType)
             {
                 case DbType.MySql:
@@ -33,9 +34,9 @@ namespace SqlSugar
                     DependencyManagement.TrySqlite();
                     break;
                 case DbType.Oracle:
-                    throw new Exception("Oracle developed 60%,to be continued ");
+                    throw new Exception("Oracle developed 60%,to be continued");
                 default:
-                    break;
+                    throw new Exception("ConnectionConfig.DbType is null");
             }
         }
         #endregion
diff --git a/Src/Asp.Net/SqlSugar/Utilities/ErrorMessage.cs b/Src/Asp.Net/SqlSugar/Utilities/ErrorMessage.cs
index 4e6e9ed67..4e5c4eace 100644
--- a/Src/Asp.Net/SqlSugar/Utilities/ErrorMessage.cs
+++ b/Src/Asp.Net/SqlSugar/Utilities/ErrorMessage.cs
@@ -71,7 +71,8 @@ namespace SqlSugar
         {
             List<string> formatArgs = new List<string>() { enMessage, cnMessage };
             formatArgs.AddRange(args);
-            return string.Format("\r\n English Message : {0}\r\n Chinese Message : {1}", formatArgs.ToArray());
+            return string.Format(@"English Message : {0}
+Chinese Message : {1}", formatArgs.ToArray());
         }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Utilities/JsonHelper.cs b/Src/Asp.Net/SqlSugar/Utilities/JsonHelper.cs
new file mode 100644
index 000000000..1c2f2a172
--- /dev/null
+++ b/Src/Asp.Net/SqlSugar/Utilities/JsonHelper.cs
@@ -0,0 +1,22 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SqlSugar
+{
+    public class JsonHelper  
+    {
+        public static string SerializeObject(object value)
+        {
+            return JsonConvert.SerializeObject(value);
+        }
+
+        public static T DeserializeObject<T>(string value)
+        {
+            var jSetting = new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore };
+            return JsonConvert.DeserializeObject<T>(value, jSetting);
+        }
+    }
+}