本文就PC 机和PLC 通讯机制进行了简要介绍，在此基础上阐述了具体实现方法，即主要通过高级语言和组态软件两种办法。并就二者具体实现进行了介绍和比较，指出了两种方法存在的优缺点。关键词：PC PLC 通讯高级语言 组态软件Abstract: The paper presents the machanism of the communication between PC and PLC。 on the base of it, the concrete fulfilling methods is introduced, that is higher-level language and configuration software. By Explaining and comparing to their working theory, Their advantages and disadvantages were pointed out。Key words: PC PLC communication higher-level language configuration software