Abstract: Intake and exhaust valve is one of the important parts of the engine. It has large production volume, high precision requirements and long processing procedure. The improvement of each process has certain significance. The traditional finishing method of valve clip spring is grinding, and the improved method is rolling processing. It not only increases the production efficiency, improves the processing quality, but also reduces the cost, improves the wear resistance and prolongs the service life. Thus it has a certain value of popularization and application.