It's very difficult to assess systemic electromagnetic damage on anti-radiation UAV only through the damage experiments. was First the systemic structure model and function model y system analysi, then hierarchy structure of HPM effect UAV and HPM effect experiments on the key subsystem or components. Finally, systemic HPM effects were done based on AHP method. The veracity of the assessment was effectively ensured by this method, and the research cost was also reduced greatly, besides, the strict experiment condition of research was lowered with strong maneuverability, and a preferable application effect was got in the task study.