The module partition is the key step and foundation of module design. Firstly,the fuzzy similitude matrix between the parts is constructed according to the analysis of the functional correlation,geometric correlation,physics correlation among parts. Secondly,the partitioned modules are evaluated by high cohesion and low coupling. Finally,the products is classified by using the simulated annealing and genetic algorithm（ SAGA）,which is proved to be an efficient and rational way for module partition through the reducer instance.