A flexible modular division method was proposed to the Reconfigurable Machine to ols （RMT）considered the influence of customer demand, the structurefunction and life cycle effect. Analytic hierarchy process (AHP) was used to weight the d ifferent influence factors and the interaction among the machine tool parts and the related matrix were obtained. The fuzzy clustering method was used to operat e the matrix. The control system was modular divided based on the specialty of R MT. The proposal for RMT modular division was obtained and could be used as the foundation of RMT developing.