Abstract: To improve the precision and efficiency of the traditional injection Molding machine,a control method of fully electric injection molder is introduced.With a summary of real-time data exchange based on SERCOSⅡ,the concept of motion control and the hardware system are mainly included.During the period of a 3-month successive test operation, the molding period can be dominated in 15 seconds when the system cycle-time is 4 ms and the injection max-volume is 70 cm³,and the product conforms well to quality and precision.