Objective According to the characteristics and laws of cam, this paper put forward an electronic cam system based on ARM7 and servo motor in order to realize cam motion instead of mechanical cam. Methods This article mainly discussed the methods of cam profile synthesis and implementation of electronic cam. The cam爷 s mathematical model was established by cubic polynomial interpolation. The control table was obtained according to the principle of given-step method and the frequency raising-lowering control of the servo motor was realized by the method of table lookup, meanwhile a method of software and hardware design was provided. Results The motion based on this system was adjustable, accurate in positioning and non-impact. Conclusion Applying this system to packaging machinery could improve features such as package speed, package precision, output-flexibility and intelligent degree. It has been proven to provide benefits to the packaging machinery.