Abstract: Based on the fuzzy matter element model and generalized quality evaluation indices, a relevant evaluation was done objectively and efficiently for products' overall quality/performance, where the index weights were determined by AHP in combination with entropy weight coefficients so as to exclude the influences from the difference between index units especially between the orders of magnitude of index values. Thus, the irrational outcome can be avoided by determining both index weights and performance indices. Taking a car as example, its overall performance was evaluated with the generalized quality evaluation using combination weights, and the results showed that the index weights are reasonably assigned with its overall performance evaluated properly and completely. The evaluation method can provide scientific reference for customers to select the products they desire and make the strategy for the enterprise to develop their products.