Abstract
This paper aims to provide modeling method of prediction for product function and develop its support system. The method in this paper is composed of three steps. The first step is to apply each part′s geometry to type of TTRS. The above method enables each part′s geometry to find its Degree of freedom. Second is to apply combinations between two parts to TTRS. The second step also enables combinations between two parts to find their degree of freedom. Based on the results of the second steps, the third step enables product to identify motion behavior. Finally, the required function and unrequired function for product will be predicted.