diff --git a/Src/Asp.NetCore2/MongoDbTest/UnitTest/Delete.cs b/Src/Asp.NetCore2/MongoDbTest/UnitTest/Delete.cs
index 1943917fe..9e0e9c330 100644
--- a/Src/Asp.NetCore2/MongoDbTest/UnitTest/Delete.cs
+++ b/Src/Asp.NetCore2/MongoDbTest/UnitTest/Delete.cs
@@ -33,8 +33,11 @@ namespace MongoDbTest
             new Student() { Age = 2, Name = "aa", SchoolId = "222", CreateDateTime = DateTime.Now.AddDays(-1) },
             new Student() { Age = 3, Name = "33", SchoolId = "333", CreateDateTime = DateTime.Now.AddDays(1) }
             }).ExecuteCommandAsync().GetAwaiter().GetResult();
-            var id2 =db.Queryable<Student>().First(it => it.Name.ToLower() == "a")?.Id??null;
-            db.Deleteable<Student>().In(id).ExecuteCommandAsync().GetAwaiter().GetResult();
+            var id2 =db.Queryable<Student>().First(it => it.Name.ToLower() == "aa")?.Id??null;
+            var count5=db.Queryable<Student>().Count();
+            db.Deleteable<Student>().In(id2).ExecuteCommandAsync().GetAwaiter().GetResult();
+            var count6 = db.Queryable<Student>().Count();
+            if (count6 != (count5 - 1)) Cases.ThrowUnitError();
         }
         [SqlSugar.SugarTable("UnitStudent1ssdds3z1")]
         public class Student : MongoDbBase
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/ComparisonOperationExpression.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/ComparisonOperationExpression.cs
index d905172da..70882c037 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/ComparisonOperationExpression.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/ComparisonOperationExpression.cs
@@ -22,7 +22,14 @@ namespace SqlSugar.MongoDb
         }
 
         private static BsonDocument ComparisonNotKeyValue(BsonValue field, BsonValue value, string op)
-        {
+        {   // 如果 field 是一个表达式对象（如 BsonDocument），则使用 $expr
+            if (field is BsonDocument bd)
+            {
+                return new BsonDocument
+                {
+                    { "$expr", new BsonDocument(op, new BsonArray { field, value }) }
+                };
+            }
             var leftKey = field.ToString();
             return new BsonDocument
                    {