With the development of automatic control technology, the application of PLC is becoming more and more widely. The sequential control method is the most common and effective programming method for PLC programming. In this paper, based on MITSUBISHI PLC, through an example to illustrate the progra-mming ideas and operation steps of sequential control method.%随着自动控制技术的发展，PLC的应用也越来越广泛，顺序控制法是进行PLC编程时最常用、最有效的编程方法。以三菱PLC为模型，通过实例来说明顺序控制法的编程思路和操作步骤。
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