Focuses on the electronic CAM function implementation methods in pillow packaging machine control system,combines PLC,servo system and Human Machine Interface technology, remove the original mechanical CAM,and now control horizontal sealing and cutting knife in variable speed rotating through the electronic CAM. This plan solved the problem in traditional mechanical CAM such as dificult installation ,lags in response, and bad measurement performance,made horizontal sealing and cutting knife sport curve can be instantly change. Meanwhile this paper puts forward a new color code tracking method and using color and photoelectric sensor to detect the feedback of packaging length in real time , in order to improve the packaging precision and reduce the system response time.