Abstract: A software testing method is realized through simulation technology. The architecture of the testing method is built with simulation technology. The simulation signals are injected into different parts of the radar system to realize the different modules testing. The simulation of radar target route and radio frequency signal is mainly emphasized and studied. The exception value,boundary value, frames lost and large amount of data of radar software is targeted tested. The radar system receives analog signals,and then forms the output track signals by signal processing and data processing modules. The radar simulation system has been applied in radar software testing, and it has achieved the desired effect.