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Aiming at the problem of the lack of quantitative index evaluation in the optimization of maintainability design scheme of civil aero-engine, a maintainability evaluation method based on improved TOPSIS is proposed. Firstly, a qualitative maintainability index system and a quantitative maintainability index system are constructed according to the design criteria of civil aero-engine, relevant maintenance standards and constraints of continuous airworthiness. The weight coefficient of each index is determined by the combination of analytic hierarchy process and entropy weight method. Through the establishment of virtual simulation maintenance environment quantitative indicators can be calculated, On the basis of the above analysis, the improved TOPSIS method is used to comprehensively evaluate the maintainability of different maintenance schemes of aero-engines. The experimental results show that the proposed method can obtain the best maintainability design, which can provide reference for the maintainability evaluation of civil aero-engine.