Nowadays,most Chinese plywood manufacturers use multilayer frame hot presses for production.However,that kind of hot press,being controlled by relays and contactors and owing to its complex control circuits and many contacts,is easy to break down.To solve this problem,thes made an improvement for this hot press by using a PLC in its control system,removing some relays,contactors and a lot of wires,so that the control circuits were simplified,and the reliability of the hot press was improved.