We should learn seal script from Xiao Zhuan. As to what kind of post to use as a model, predecessors have summed up many successful experiences, whether it is the stone carving in the pre-Qin period or the posts of various factions in the Qing Dynasty, which have had a great influence on seal script learners. Wang Fuan is a famous calligrapher and seal engraver in modern times. Once Shuo Wen Bu Tou was published, seal engravers used it as a copy model, which was widely praised.