diff --git a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
index 3726ccad7..442fe44c2 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
@@ -657,12 +657,18 @@ namespace SqlSugar
             {
                 shortName = this.Builder.GetTranslationColumnName(shortName);
             }
-            return string.Format(
+            var result= string.Format(
                 this.JoinTemplate,
                 joinInfo.JoinType.ToString() + UtilConstants.Space,
                 Builder.GetTranslationTableName(name) + UtilConstants.Space,
                 shortName + UtilConstants.Space + (TableWithString == SqlWith.Null|| isSubQuery ? " " : TableWithString),
                 joinInfo.JoinWhere);
+            if (joinInfo.EntityType!=null&&this.Context.EntityMaintenance.GetEntityInfoWithAttr(joinInfo.EntityType).Discrimator.HasValue()) 
+            {
+                var entityInfo = this.Context.EntityMaintenance.GetEntityInfoWithAttr(joinInfo.EntityType);
+                result = $" {result} AND {shortName}.{UtilMethods.GetDiscrimator(entityInfo,this.Builder)}";
+            }
+            return result;
         }
         public virtual void Clear()
         {
diff --git a/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs b/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
index 30b904628..399636a26 100644
--- a/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
+++ b/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
@@ -1312,6 +1312,22 @@ namespace SqlSugar
                 }
             }
         }
+        internal static string GetDiscrimator(EntityInfo entityInfo,ISqlBuilder  builer)
+        { 
+            List<string> wheres = new List<string>();
+            if (entityInfo != null && entityInfo.Discrimator.HasValue())
+            {
+                Check.ExceptionEasy(!Regex.IsMatch(entityInfo.Discrimator, @"^(?:\w+:\w+)(?:,\w+:\w+)*$"), "The format should be type:cat for this type, and if there are multiple, it can be FieldName:cat,FieldName2:dog ", "格式错误应该是type:cat这种格式，如果是多个可以FieldName:cat,FieldName2:dog，不要有空格");
+                var array = entityInfo.Discrimator.Split(',');
+                foreach (var disItem in array)
+                {
+                    var name = disItem.Split(':').First();
+                    var value = disItem.Split(':').Last();
+                    wheres.Add($"{builer.GetTranslationColumnName(name)}={value.ToSqlValue()} ");
+                }
+            }
+            return string.Join(" AND ", wheres);
+        }
 
     }
 }