The economic and efficient level of repair is needed for the invalid parts in reality, which is often affected by many factors. Combined with the existing results, the decision-making flow chart is utilized for multi-level maintenance process of a certain equipment from the perspective of qualitative and quantitative. A multi-objective optimization model including economic and non-economic indicators is built. The optimal solution is determined by the combination of TOPSIS (technique for order preference by similarity to an ideal solution) and genetic algorithm which is illustrated effectively, and provides a reference for maintenance support of equipment.