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In the use of radome, it may cause damage to cover body, skin shedding and skin perforation, which will affect the electrical performance of radome. Aiming at the requirement of electric performance test for airborne radome under external conditions, a portable and convenient radar performance test system is designed. The testing scheme of the radar cover electrical performance parameters, such as the penetration rate, the insertion phase shift and the medium constant, is given, the electrical performance parameters of radome samples were tested. Test results show that: the system can conveniently measure the electrical performance parameters of radome under external conditions, and the test results are real and effective.