In order to improve the integrity, correctness,stability and fast of the active microwave device test,ensure the reliability,stability of aerospace products communication products, weapon whole system, it is improtant to identify the interference factors and avoid the bad influence. According to the testing principle of active microwave devices, combined with the testing requirement of active wave devices, the interference factors of 8 serious threat tests are found and feasible anti-interference countermeasures are found, which has deep guiding significance for testing.