The word "jig" is directly translated from Japanese characters. With a large number of Japanese businessmen entering the mainland, "jig" is also registered in the mainland, so jig is a typical foreign word. In fact, the mainland is called Jige. For example, an operator should install two screws on an electrical product, with the product in his left hand and the batch in his right hand. It is ok to operate in a short time, but over time it will cause excessive fatigue of employees and decrease efficiency and quality. At this time, the process engineer will consider doing it-the common treatment methods are: automation equipment, fixtures, test fixtures, SMT furnace fixtures, precision parts, blades, DVD card readers and so on.