为解决某导弹自动测试系统软件测试难度大的问题，介绍了常用提高软件可测试性的方法和DLL技术。并运用COM技术设计出该系统的组件软件，显著提高了自动测试系统软件的可测试性。关键词：组件软件，可测试性，自动测试系统Application of COM Technology in Improving ATS Software Testability ZHANG Jian，MENG Chen，WANG Cheng (Ordnance Engineering College，Shijiazhuang 050003，China)Abstract: In order to solve problems in testing course, we introduced some methods and DLL technoloygy. we design a software based on the COM technology for a missile weapon systems. The practices have proved that it can improve the software testability greatly.Keywords: component software, testability, ATS.