Radar digital IF system is the core component of radar receiving system, its performance directly affects the efficiency of the whole radar system. The hardware test platform and software control program of a portable digital IF test system are introduced. Through the A/D signal data acquisition and I/Q data test of the weather radar digital intermediate frequency, the analysis of the digital IF A/D Signal and I/Q data FFT frequency domain analysis interface and Time Data time domain analysis interface graphics, can quickly analyze, process and display, can be accurate and efficient completion of the weather radar digital IF testing and maintenance; the system completely Which solves the condition that the radar station can not be equipped with expensive equipment such as spectrum analyzer, shortens the time and effectiveness of the technical support, and improves the service guarantee aging of the weather radar, thus providing a new solution to the onthespot test security system of the weather radar Program.