Cam mechanism has advantages of compact structure, high driving accuracy, good dynamic characteristics, smooth motion, etc. It is implemented that components transmission among the multiple-station of deep groove ball bearing assembly machine by use of cam drive system. Cam followers depending on cam profile achieve the desired law of motion. The core of cam design is the exact cam profile’s design. The quick and easy method of cam profile design through Pro/E software is introduced in follow. Components’ transmission requirements can be met by cam drive system, which is proved through the analysis of motion simulation.