diff --git a/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs b/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs
index 13c58d8d9..edec2ff9f 100644
--- a/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs
+++ b/Src/Asp.Net/SqlSugar/Infrastructure/InstanceFactory.cs
@@ -207,6 +207,10 @@ namespace SqlSugar
             {
                 return new OracleInsertable<T>();
             }
+            else if (currentConnectionConfig.DbType == DbType.PostgreSQL)
+            {
+                return new PostgreSQLInserttable<T>();
+            }
             else
             {
                 return new InsertableProvider<T>();
diff --git a/Src/Asp.Net/SqlSugar/OnlyNet/PostgreSQLExpressionContext.cs b/Src/Asp.Net/SqlSugar/OnlyNet/PostgreSQLExpressionContext.cs
index 6bf97aacd..32a0c8699 100644
--- a/Src/Asp.Net/SqlSugar/OnlyNet/PostgreSQLExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/OnlyNet/PostgreSQLExpressionContext.cs
@@ -5,6 +5,9 @@ using System.Text;
 
 namespace SqlSugar
 {
+    internal class PostgreSQLInserttable<T> :InsertableProvider<T> where T : class, new()
+    {
+    }
     internal class PostgreSQLExpressionContext : ExpressionContext, ILambdaExpressions
     {
         public SqlSugarClient Context
diff --git a/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Config.cs b/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Config.cs
index f526fa969..f6e313fb4 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Config.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Config.cs
@@ -8,8 +8,8 @@ namespace OrmTest
 {
     public class Config
     {
-        public static string ConnectionString = "PORT=5432;DATABASE=SqlSugar4xTest;HOST=localhost;PASSWORD=jhl52771;USER ID=postgres";
-        public static string ConnectionString2 = "PORT=5432;DATABASE=SqlSugar4xTest;HOST=localhost;PASSWORD=jhl52771;USER ID=postgres";
-        public static string ConnectionString3 = "PORT=5432;DATABASE=SqlSugar4xTest;HOST=localhost;PASSWORD=jhl52771;USER ID=postgres";
+        public static string ConnectionString = "PORT=5432;DATABASE=SqlSugar4xTest;HOST=localhost;PASSWORD=haosql;USER ID=postgres";
+        public static string ConnectionString2 = "PORT=5432;DATABASE=SqlSugar4xTest;HOST=localhost;PASSWORD=haosql;USER ID=postgres";
+        public static string ConnectionString3 = "PORT=5432;DATABASE=SqlSugar4xTest;HOST=localhost;PASSWORD=haosql;USER ID=postgres";
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demos/5_CodeFirst.cs b/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demos/5_CodeFirst.cs
index cbe2816fb..ce21adb4c 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demos/5_CodeFirst.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demos/5_CodeFirst.cs
@@ -47,7 +47,7 @@ namespace OrmTest.Demo
                 InitKeyType = InitKeyType.Attribute 
             });
 
-            db.CodeFirst.InitTables(typeof(Student), typeof(School));
+            db.CodeFirst.SetStringDefaultLength(30).InitTables(typeof(Student), typeof(School));
 
             //Backup table
             //db.CodeFirst.BackupTable().InitTables(typeof(CodeTable),typeof(CodeTable2));