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Performance of secondary radar has intimate relationship with safe flights. Special attentions are needed while testing high power modules. Developing general automatic test system for power amplifier modules of secondary radar can raise maintenance abilities and reduce maintenance costs. The system is able to test many kinds of power amplifier modules based on mixed PXIe, LXI/LAN and GPIB buses. It uses PXIe embedded PC as control center, uses the ‘test boxes’ as testing center, and realizes adaptations between UUT and PXIe cards and instruments through adaptor. This paper states general system designs from aspects of test requirements, choice of instruments, TPS developing environment and system structures, brings forward a testing method of insertion phase based on spectrum analyser, and analyses general designs on test boxes, adaptor and automatic calibration compensation. The system can realize wide power range of stimulation, test and calibration, reduce configuration of expensive vector network analyser, and has high test precisions and notable economic benefits.