In order to overcome the fault that the pressure and temperature of main airflow can’t be controlled synchronously and improve the automation level of the wind tunnel, this author analyses the pressure control principle of main airflow. Fuzzy control concept was introduced in the system design, input and output variables were defined, fuzzy control regulation and measure of undoing faintness was found, PLC control program was projected, fuzzy control strategy was optimized. Two general states, viz. Ma=5 and Ma=6, were adjusted. The test result show that, along with temperature ascending, auto-adjust effect of pressure is favorable. Pressure and temperature can basically ascend in phase, and the precision can satisfy test demand. Accordingly, automation level of the wind tunnel test has been heightened. It has proved the rationality of fuzzy control in the system.%为了克服某风洞主气流压力、温度不能自动同步控制的缺陷，提高风洞的自动化水平，分析了主气流压力控制原理，在系统设计时引入了模糊控制的概念，定义了输入输出变量，建立了模糊控制规则表和解模糊化方法，完成了PLC控制程序设计，对模糊控制策略进行了优化，并选取了马赫数5和马赫数6这2种常规状态进行了调试。调试结果表明：随着温度的上升，压力自动调节效果良好，基本达到了与温度的同步上升，并且精度满足试验要求。从而提高了风洞试验的自动化水平，证明了模糊控制在该系统中应用的合理性。
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