Aero-engine parts such as blisks and impellers have complex shapes and high precision requirements, which pose great challenges to traditional processing methods. Additive-subtractive hybrid machining method can be used to machine before obstacles formed, which is an effective way to solve complex part processing problems. In view of the above problems, the impeller is decomposed into two parts, the blade and the disc based on geometric features. The fiveaxis annular slicing method is used to plan the additive-subtractive hybrid machining process of the impeller. Based on an self-built five-axis hybrid processing platform, an impeller was processed and tested to verify the feasibility of the hybrid processing planning method proposed in this paper.