Abstract: By calling the C++ code dynamic link library through the SystemVue software simulation platform, the simulation model of weather radar pulse modulator is established, the simulation formula of the modulator flyback charging process is given, the generation of the modulator′s key point waveforms and the simulation of common faults are studied. The simulation results show that the simulation model can realize the simulation of the common faults of the modulator and the flyback charging process of the modulator,and output the negative modulation pulse that meets the requirements.