Abstract: To investigate the effects of complex electromagnetic environment on radio fuze, the method of building an environment with dual radio sources and the testing process were put forward. The electromagnetic environment effects on the radio fuze was measured, and different frequency combinations of the two sources which initiate accidental detonation of the radio fuze were studied. It is found that the signal the radio fuze antenna and projectile received was a Doppler signal, which would be mixed by an autodyne receiver oscillator, detected and filtered by a rectifier, then a sine wave with high amplitude output. With the effects of low frequency circuit, the rectification and integrating circuit, and the anti-interference inertia branch circuit, the signal would pass the amplification rate selecting circuit, then the executive circuit would be triggered, and the radio fuze would explode accidentally.