To resolve the lack of rational and ?exible calculation problem of spare parts price for domesticcivil aircraft, this paper studies the pricing of spare parts from different dimensions, by synthesizing the effects of various factors, obtains the decomposition structure model of sales expenses of different types of spare parts is obtained. Firstly, the components of civil aircraft spare parts cost are elaborated. Then, the influencing factors of spare parts price are analyzed from the perspective of life cycle. Finally, the decomposition structure model of sales expenses of domestic civil aircraft is established with different spare parts in the life cycle. The research results comprehensively investigate the influencing factors of spare parts price of domestic civil aircraft models, and provide support for the establishment of spare parts sales price.