在换热器的传热性能试验中，对流换热系数的测定是重要的一个组成部分，对流换热系数的测定方法有很多种，但都有各自的应用范围和条件。对于板式换热器而言，用等雷诺数法来获得其对流换热系数是比较合适的一种方法，文中介绍了等雷诺数法的原理及其在板式换热器中的应用。通过实例，介绍了具体的试验及计算方法。 In the heat exchanger performance test, convection heat transfer coefficient is an important part of the determination of convection heat transfer coefficient There are many ways, but they have their own scope and conditions of application. For the plate heat exchanger, Reynolds number method to obtain its convection heat transfer coefficient is a more appropriate method, the paper introduced the principle of Reynolds number and its application in the plate heat exchanger. Through the example, the specific test and calculation method are introduced.