The microwave generation process is difficult to display intuitively, Traditional experiments usually can only observe the changes in microwave electric field and magnetic field intensity through an oseillo scope This method is often difficult to help students deeply understand relevant physical concepts in traditional theoretical teaching. To improve students ’understanding of experimental principles, we have designed and developed a virtual simulation laboratory for microwave experiments. Through the virtual experiment , students can complete teaching tasks such as previewing, operating, and writing experiment reports, At the same time, teachers can also conduct teaching management in the background, With the help of advanced computation a simulation technology, the virtual simulation laboratory for micro wave experiments breaks through the limitations of real experiments in the observation of micro scopic phenomena. This platform can not only vividl show the principle of microwave generation by a reflection klystron ,but also present the electromagnetic field distribution of different modes in a waveguide , helping students understand the transmission principles and charaeter isties of microwaves more intuitively, The results of five years of teaching practice show that the application of the microwave experiment virtual laboratory has signilicantly improved teaching elfeetiveness.