Snap button is a kind of springfastener. Snap buttons from top to bottom is divided into four parts known as ABCD, these parts together by S-type spring. The AB is called the mother button, which broadside can be carved patterns, hole in the middle, and side with two parallel springs; the CD is called the father button, and prominent among a dot that clamped by the spring after pressed into the hole of the mother botton, and then opening force generated, fixed clothing. Snap button is widely used. Clothing, luggage, handbags, shoes, hats, and packaging often used it. Snap button fixed on the clothes by way of tapping mode sewn