¡@¡@The transmission system of manpower-drive vehicles always plays an important role in promotion of riding performance and enjoyment. The purpose of this research is to develop a systematic methodology for the design of the transmission system of the manpower-drive vehicles. First, analyzing the patents of manpower-drive vehicles. Drawing the function structure of the transmission and concluding the basic characteristic. Second, getting several innovative ideas of transmission systems by systematic methodology and comparing with products in patents. Third, according to the requirement charts to design steering systems and frames. Fourth, all design concept variant can be created by using morphological chart method. Several design concepts can be created for new manpower-drive vehicles. Finally, using computer software to assist drawing the models and manufacturing the models. And to establish a simple systematic procedure.