介绍了一种基于C8051F的大容量电缆线束自动测试仪的硬件和软件的设计和实现。该测试仪不仅可以测量电缆线束的毫欧级电阻和绝缘性能，而且可给电缆的设计、生产和检测提供一个一体化的管理手段。文章重点介绍了测试仪的硬件结构、关键电路以及软件的功能结构等。关键词：电缆自动测试; C8051F; 恒流源; 数据库Design and Realization of The Cable Automatic Test System HUANG Yan-hua, MEI Shun-liang (Dept. of Electronic Engineering ,Tsinghua University,Beijing,China,100084) Abstract The article introduces the design of the cable automatic test system based on the C8051F MCU.The tester not only testes the milliohm and megohm resistor of cable,but also provides a solution to the cable design , manufacture and test.The article puts emphasis on the realization of hardware circuits and software architecture.Keywords Cable automatic test; C8051F ; Current source; Database