本文介绍了西门子S7-200可编程序控制器在风压平衡器自动控制系统中的设计与实现。结合卷烟生产工艺，分析了在卷烟生产过程中应用风压平衡器的必要性。根据S7-200可编程序控制器的特点，详细介绍其在控制风压中运用的控制原理，软件及硬件的实现方法。设计完成的系统运行可靠、操作方便、具有很强的实用性。关键词： 风压平衡器 PID调节 可编程序控制器 步进电机 传感器ABSTRACT This paper introduces that the design and realization of SIEMENS’ S7-200 PLC in Automation Controlling System for Air-Pressure-Balancer. Combining the technics of cigarette-producing , we analyze the requirement with the Air-Pressure-Balancer in project. according the character of s7-200 PLC ,we introduce the principle of controlling and the designing way of hardware and software in air-pressure controlling .the built-system run well ,operate simply and is applied.KEYWORD Air-Pressure-Balancer PID-Adjusting PLC Step-Motor Sensor