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The parts-selection model of mechanical products for MC strategy was presented. The model integrated the relational diagram model and the hierarchical assembly model of product. Some data objects such as interfaces, rules and constraints have been introduced into the model. Using this model, the knowledge, relations and experiences of the product could be expressed conveniently, and the parts could be selected initially. An uncertain multiple attribute decision making method based on CWGA operator and maximizing deviation method was presented to optimize the parts selection. A case study was also presented to illuminate the proposed method. 