描述了基于PDA的通过调用WebService方法对工件数据采集和查询的系统。该系统在实际MES工程中测试通过，通过扫描条形码获取相关信息提高工作效率。-This paper describes a PDA-based mobile system of workpiece data inquiring and acquisition that can process data by calling the Web Service. The system is practically tested and verified in a MES project, the result shows that it can provide the effective product information through scanning bar code, and improve the rapid reaction capability and work efficiency greatly