This paper introduces the first air fan of the boiler frequency conversion mode automatically switch frequency operation principle and the basic train of thought of design, analysis of # 2 unit of Ningxia Daba power plant. the control strategies of actual application put forward the problem and put forward the control system design of the solution.%本文介绍了锅炉一次风机变频方式自动切工频运行的原理及设计的基本思路，分析宁夏大坝发电有限责任公司#2机组实际应用的控制策略，提出控制系统设计时的问题所在并提出解决方法。
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