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In order to obtain the influence of the physical damage of the egg-shaped radome on the performance of the airborne fire control radar, the measurement method of electromagnetic wave transmittance characteristics of the radome was studied, and electromagnetic wave transmittance characteristics of damaged area as well as transmittance consistency of radome were measured. Electromagnetic wave transmittance and insert phase shift were selected to measuring the radome"s wave transmission performance. With regard to problem that electromagnetic wave transmittance and insert phase shift were difficult to measure, the way that measuring s21 component of S parameter by vector network analyzer and indirectly got electromagnetic wave transmittance and insert phase shift was put forward. Firstly, electromagnetic wave transmittance characteristics of different level damaged areas were measured, which indicated that damaged edge areas’ electromagnetic wave transmittance characteristics decrease dramaticly. Horizontal consistency and vertical consistency of egg-shaped radome’s electromagnetic wave transmittance characteristics were also measured, which indicated that damage would affect the consistency of electromagnetic wave transmittance characteristics, especially insert phase shift of vertical consistency. According to measure result, damages would affect electromagnetic wave transmittance characteristics of airborne radar’s egg-shaped radome, and damaged need to be replaced in time.