将复杂可编程逻辑器件CPLD用于机车电子控制系统，可大大地简化系统设计、提高电子插件板的集成度和系统的可靠性。文章以CPLD器件在8K机车最复杂的插件板之一──辅助系统交直交交流器控制板RDA753上的应用为例，介绍在系统可编程逻辑电路ispLSI的特点、编程技术及自顶向下的模块化设计方法。 The complex programmable logic device CPLD for locomotive electronic control system, can greatly simplify system design, improve the integration of electronic board and system reliability. The article takes the application of CPLD device in the RDA753, one of the most complex plug-in boards of 8K locomotive, that is the AC / DC AC / DC converter control board, and introduces the characteristics of ispLSI, programming technology and top-down Modular design method.