介绍了对BD № 2 2型对旋主通风机进行的三种叶片安装角度下的性能测试 ,包括测风、测压断面位置的选择 ;测量风量方法的选择 ,工况调节 ,测定数据的处理 ,结果分析及通风机测定时应注意的问题 This paper introduces the performance test of three kinds of blade mounting angles of BD № 2 2 main rotating fan, including the selection of wind measurement and pressure measurement section, the selection of measuring air volume, the adjustment of working conditions and the processing of measured data Results analysis and problems to be noticed in the determination of ventilator