Fang Zhuan, which evolved from Xiao Zhuan, is smooth and beautiful, but it is not easy to write, which requires higher calligraphy attainments, especially when it is used for stone carving or chapter engraving, and it is even more difficult to grasp some hard stones, such as jade. Then came Fang Zhuan, which was angular and dominated by straight lines, which laid the foundation for the popularization of seal script and promoted the writing of subordinate, regular script and Song style.