Seal cutting is a unique seal cutting with artistic value in China. Because most ancient seals were named after seal script printing. After Qin Shihuang unified China, it was stipulated that the emperor should use the seal, the seal of ordinary people. Sealing materials include copper, gold, silver, iron, etc. Pyrophyllite and frozen stone in Qingtian stone were mostly used in Ming and Qing Dynasties. The main conditions of seal cutting are seal cutting, composition and knife cutting. Composition refers to the arrangement and layout of characters in seal script, that is, "dividing Zhu into white", which follows the artistic law of dense edges between reality and reality. Knife method refers to the difference in appearance and interest of knife marks caused by different knife methods. The ancients carved knives with pens, also called iron pens. It is an accessory part of seal cutting, and it has the name of edge payment and top payment.