diff --git a/Src/Asp.Net/SqlServerTest/Demos/4_Delete.cs b/Src/Asp.Net/SqlServerTest/Demos/4_Delete.cs
index 960434203..1276ea3ee 100644
--- a/Src/Asp.Net/SqlServerTest/Demos/4_Delete.cs
+++ b/Src/Asp.Net/SqlServerTest/Demos/4_Delete.cs
@@ -26,8 +26,8 @@ namespace OrmTest.Demo
             //by primary key array
             var t4 = db.Deleteable<Student>().In(new int[] { 1, 2 }).ExecuteCommand();
 
-            //by expression
-            var t5 = db.Deleteable<Student>().Where(it => it.Id == 1).ExecuteCommand();
+            //by expression   id>1 and id==1
+            var t5 = db.Deleteable<Student>().Where(it => it.Id > 1).Where(it => it.Id == 1).ExecuteCommand();
         }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/DeleteBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/DeleteBuilder.cs
index 7f99e5703..3fb867aa7 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/DeleteBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/DeleteBuilder.cs
@@ -125,11 +125,12 @@ namespace SqlSugar
             resolveExpress.MappingTables = Context.MappingTables;
             resolveExpress.IgnoreComumnList = Context.IgnoreColumns;
             resolveExpress.Resolve(expression, resolveType);
-            this.Parameters = new List<SugarParameter>();
+            if (this.Parameters == null)
+                this.Parameters = new List<SugarParameter>();
             this.Parameters.AddRange(resolveExpress.Parameters);
             var reval = resolveExpress.Result;
             return reval;
-        } 
+        }
         #endregion
     }
 }