diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbBuilder.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbBuilder.cs
index f786494a9..5ed22d3e7 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbBuilder.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
 
@@ -123,5 +124,142 @@ namespace SqlSugar.MongoDb
             }
             return null;
         }
+
+        public override KeyValuePair<string, SugarParameter[]> ConditionalModelToSql(List<IConditionalModel> models, int beginIndex = 0)
+        {
+            // MongoDB的查询条件通常以JSON格式表达，不需要参数化
+            if (models == null || models.Count == 0)
+                return new KeyValuePair<string, SugarParameter[]>("{}", Array.Empty<SugarParameter>());
+
+            if (models.Count == 1 && models.First() is ConditionalCollections collections)
+            {
+                return ConditionalModelToSqlByConditionalCollections(collections);
+            }
+
+            var filterParts = new List<string>();
+            foreach (var model in models)
+            {
+                if (model is ConditionalModel cond)
+                {
+                    string field = cond.FieldName;
+                    string op = cond.ConditionalType + "";
+                    string fieldValue = cond.FieldValue;
+                    object value= SqlSugar.UtilMethods.ConvertDataByTypeName(cond.CSharpTypeName, fieldValue);
+                    switch (op)
+                    {
+                        case "Equal":
+                            filterParts.Add($"\"{field}\": {ToMongoValue(value)}");
+                            break;
+                        case "NotEqual":
+                            filterParts.Add($"\"{field}\": {{ \"$ne\": {ToMongoValue(value)} }}");
+                            break;
+                        case "GreaterThan":
+                            filterParts.Add($"\"{field}\": {{ \"$gt\": {ToMongoValue(value)} }}");
+                            break;
+                        case "GreaterThanOrEqual":
+                            filterParts.Add($"\"{field}\": {{ \"$gte\": {ToMongoValue(value)} }}");
+                            break;
+                        case "LessThan":
+                            filterParts.Add($"\"{field}\": {{ \"$lt\": {ToMongoValue(value)} }}");
+                            break;
+                        case "LessThanOrEqual":
+                            filterParts.Add($"\"{field}\": {{ \"$lte\": {ToMongoValue(value)} }}");
+                            break;
+                        case "In":
+                            filterParts.Add($"\"{field}\": {{ \"$in\": {ToMongoArray(value)} }}");
+                            break;
+                        case "Like":
+                            // MongoDB的模糊查询用正则表达式
+                            filterParts.Add($"\"{field}\": {{ \"$regex\": {ToMongoRegex(value)}, \"$options\": \"i\" }}");
+                            break;
+                        case "IsNull":
+                            filterParts.Add($"\"{field}\": null");
+                            break;
+                        case "IsNotNull":
+                            filterParts.Add($"\"{field}\": {{ \"$ne\": null }}");
+                            break;
+                        default:
+                            // 其他操作符可扩展
+                            break;
+                    }
+                }
+                // 其他类型的IConditionalModel可扩展
+            }
+
+            string filter = "{ " + string.Join(", ", filterParts) + " }";
+            return new KeyValuePair<string, SugarParameter[]>(filter, Array.Empty<SugarParameter>());
+
+            // 辅助方法：将C#对象转换为MongoDB JSON值
+            static string ToMongoValue(object value)
+            {
+                if (value == null) return "null";
+                if (value is string s) return $"\"{EscapeString(s)}\"";
+                if (value is bool b) return b ? "true" : "false";
+                if (value is DateTime dt) return $"{{ \"$date\": \"{dt:O}\" }}";
+                if (value is Enum) return Convert.ToInt32(value).ToString();
+                if (value is IEnumerable<object> arr) return ToMongoArray(arr);
+                if (value is IEnumerable<string> arrStr) return ToMongoArray(arrStr);
+                return value.ToString();
+            }
+
+            static string ToMongoArray(object value)
+            {
+                if (value is System.Collections.IEnumerable enumerable && !(value is string))
+                {
+                    var items = new List<string>();
+                    foreach (var item in enumerable)
+                    {
+                        items.Add(ToMongoValue(item));
+                    }
+                    return "[ " + string.Join(", ", items) + " ]";
+                }
+                return "[ " + ToMongoValue(value) + " ]";
+            }
+
+            static string ToMongoRegex(object value)
+            {
+                if (value == null) return "\"\"";
+                return $"\"{EscapeString(value.ToString())}\"";
+            }
+
+            static string EscapeString(string s)
+            {
+                return s.Replace("\\", "\\\\").Replace("\"", "\\\"");
+            }
+        }
+
+        private KeyValuePair<string, SugarParameter[]> ConditionalModelToSqlByConditionalCollections(ConditionalCollections collections)
+        {
+            // collections.ConditionalList: List<KeyValuePair<string, List<IConditionalModel>>>，每个子List是一个分组，Key为分组的WhereType
+            var groupFilters = new List<string>();
+            var allParameters = new List<SugarParameter>();
+            int paramIndex = 0;
+
+            foreach (var group in collections.ConditionalList)
+            { 
+                var result = this.ConditionalModelToSql(new List<IConditionalModel>() { group.Value }, paramIndex);
+                string filter = result.Key;
+                SugarParameter[] parameters = result.Value;
+
+                if (!string.IsNullOrWhiteSpace(filter) && filter != "{}")
+                {
+                    string innerFilter = filter.Trim();
+                    if (innerFilter.StartsWith("{") && innerFilter.EndsWith("}"))
+                    {
+                        innerFilter = innerFilter.Substring(1, innerFilter.Length - 2).Trim();
+                    }
+                    if (!string.IsNullOrEmpty(innerFilter))
+                    { 
+                        string groupOperator = group.Key == WhereType.Or ? "$or" : "$and";
+                        groupFilters.Add($"\"{groupOperator}\": [ {{ {innerFilter} }} ]");
+                        allParameters.AddRange(parameters);
+                        paramIndex += parameters.Length;
+                    }
+                }
+            } 
+            var finalFilter 
+                  = "[ " + string.Join(", ", groupFilters.Select(f => "{ " + f + " }")) + " ] "; 
+            return new KeyValuePair<string, SugarParameter[]>(finalFilter, allParameters.ToArray());
+        }
     }
 }