Maintainability design attributes of product are determined by analysis of maintainability influencing factors;and the calculation method of each attribute was proposed by means of maintenance task virtual simulation,rapid upper limb assessment and maintainability checklist.In terms of multiple attribute decision-making theory,the normalization methods of maintainability attributes were proposed, and the comprehensive maintainability evaluation model of products was established based on fuzzy theory and multiple attribute decision making method.At last,a comprehensive evaluation instance, combined with two different types of nose landing gear system’s virtual mock-ups,was given to illustrate the effectiveness of the model.