diff --git a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryJson.cs b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryJson.cs
index ab620dd2f..eec63b64b 100644
--- a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryJson.cs
+++ b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryJson.cs
@@ -21,6 +21,11 @@ namespace MongoDbTest
             var data2 = db.Queryable<Student>().Where(it => it.Book.Price == 1).ToList();
             if (data2.Count != 1) Cases.ThrowUnitError();
             if (data2.First().Book.Price != 1) Cases.ThrowUnitError();
+            data2.First().Book.Price = 100;
+            db.Updateable(data2).ExecuteCommand();
+            var data3 = db.Queryable<Student>().Where(it => it.Book.Price == 100).ToList();
+            if (data3.Count != 1) Cases.ThrowUnitError();
+            if (data2.First().Book.Price != 100) Cases.ThrowUnitError();
         }
 
         [SqlSugar.SugarTable("UnitStudentdfsds3zzz1")]
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbUpdateBuilder.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbUpdateBuilder.cs
index bb1c3db64..867c568fb 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbUpdateBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbUpdateBuilder.cs
@@ -121,8 +121,16 @@ namespace SqlSugar.MongoDb
                     }
                     else
                     {
-                        var bsonValue =  UtilMethods.MyCreate(col.Value);
-                        setDoc[col.DbColumnName] = bsonValue;
+                        if (col.IsJson)
+                        { 
+                            var bsonValue = BsonDocument.Parse(col.Value?.ToString());
+                            setDoc[col.DbColumnName] = bsonValue;
+                        }
+                        else
+                        {
+                            var bsonValue = UtilMethods.MyCreate(col.Value);
+                            setDoc[col.DbColumnName] = bsonValue;
+                        }
                     }
                 }