Abstract: Product level reusing is the first recovery grade for used product. The mode of product reusing is studied and the five patterns of product level reusing are presented. A programming model for optimized maintenance design of product reusing is developed. Objective of the model is to determine rate of maintenance improvement of every product characteristic and maximize customer satisfaction. Limited resource constraint is considered. The maintenance importance of product characteristic is determined by using expert weight-customer probability coefficient method. There is an example that shows the model is general enough to design maintenance program for product reusing.

Key words: Importance, Maintenance design, Product level reusing, Rate of improvement, Finite element method, Hypoid gear, Loaded tooth contact analysis, Time-varying mesh parameters