diff --git a/backend/services/trading-service/src/api/dto/c2c.dto.ts b/backend/services/trading-service/src/api/dto/c2c.dto.ts
index 5645027f..b3097387 100644
--- a/backend/services/trading-service/src/api/dto/c2c.dto.ts
+++ b/backend/services/trading-service/src/api/dto/c2c.dto.ts
@@ -1,5 +1,6 @@
-import { IsString, IsIn, IsOptional, IsNumberString } from 'class-validator';
+import { IsString, IsIn, IsOptional, IsNumberString, IsInt } from 'class-validator';
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { Type } from 'class-transformer';
 
 // ==================== C2C 订单类型和状态 ====================
 
@@ -110,12 +111,16 @@ export class QueryC2cOrdersDto {
   @IsIn(['BUY', 'SELL'])
   type?: 'BUY' | 'SELL';
 
-  @ApiPropertyOptional({ description: '页码' })
+  @ApiPropertyOptional({ description: '页码', default: 1 })
   @IsOptional()
+  @Type(() => Number)
+  @IsInt()
   page?: number;
 
-  @ApiPropertyOptional({ description: '每页数量' })
+  @ApiPropertyOptional({ description: '每页数量', default: 20 })
   @IsOptional()
+  @Type(() => Number)
+  @IsInt()
   pageSize?: number;
 }
 
@@ -128,12 +133,16 @@ export class QueryMyC2cOrdersDto {
   @IsIn(['PENDING', 'MATCHED', 'PAID', 'COMPLETED', 'CANCELLED', 'EXPIRED'])
   status?: string;
 
-  @ApiPropertyOptional({ description: '页码' })
+  @ApiPropertyOptional({ description: '页码', default: 1 })
   @IsOptional()
+  @Type(() => Number)
+  @IsInt()
   page?: number;
 
-  @ApiPropertyOptional({ description: '每页数量' })
+  @ApiPropertyOptional({ description: '每页数量', default: 20 })
   @IsOptional()
+  @Type(() => Number)
+  @IsInt()
   pageSize?: number;
 }