diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/SqlFuncExpression.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/SqlFuncExpression.cs
index a93122443..16c46922b 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/SqlFuncExpression.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/SqlFuncExpression.cs
@@ -64,7 +64,7 @@ namespace SqlSugar.MongoDb
         }
         public static readonly List<string> AllowedDateParts = new List<string>()
         {
-            "Date", "Year", "Month", "Day", "Hour", "Minute", "Second", "Millisecond"
+            "Date","DayOfWeek", "Year", "Month", "Day", "Hour", "Minute", "Second", "Millisecond"
         };
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
index 2309b0d9b..0e9b7df7d 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
@@ -386,7 +386,11 @@ namespace SqlSugar.MongoDb
                 case DateType.Millisecond:
                     return new BsonDocument("$millisecond", $"${itemValue}").ToJson(UtilMethods.GetJsonWriterSettings());
                 case DateType.Weekday:
-                    return new BsonDocument("$week", $"${itemValue}").ToJson(UtilMethods.GetJsonWriterSettings());
+                    return new BsonDocument("$subtract", new BsonArray
+                    {
+                        new BsonDocument("$dayOfWeek", $"${itemValue}"),
+                        1
+                    }).ToJson(UtilMethods.GetJsonWriterSettings());
                 case DateType.Quarter:
                     // MongoDB 没有直接的quarter操作符，需自定义表达式
                     var expr = new BsonDocument("$add", new BsonArray