介绍了激光衍射粒子测试系统的程序模块设计。该模块设计主要采用了面向对象的程序设计方法 ,应用程序全部为图形用户界面 ,使系统具有良好的可扩充性和可持续发展性。系统的功能模块主要包括 :文件服务模块、测试设置模块、系统调整模块、实时采集模块、数据处理模块、帮助模块等几个部分。这些模块相互独立而又相辅相成 ,使系统在 Win95 (Win98)下能够比较稳定地运行。通过大量的试验证明 ,该激光衍射粒子测试系统具有应用范围广 ,数据处理快 ,性能可靠等特点 The program module design of laser diffraction particle testing system is introduced. The module design mainly uses the object-oriented programming method, the application program is all the graphical user interface, so that the system has good scalability and sustainable development. System function modules include: file service module, test setup module, system adjustment module, real-time acquisition module, data processing module, help module and several other parts. These modules are independent of each other and complement each other, so that the system can run relatively stable under Win95 (Win98). Through a large number of experiments show that the laser diffraction particle testing system has a wide range of applications, data processing, reliable performance and so on