According to legend, Urgent Chapter was written by Wu during the Three Kingdoms period, and also by You, Mrs. Jin Wei or Wang Xizhi. The original work is Cao Zhang's style, which was originally a block print. The printed version has Yu Youren's collection of Taihe Guanben, which is rare now. In the fourth year of Ming Dynasty (A.D. 1439), Zheng Yang carved the stone "Songjiang Ben" based on Ye Mengde's copy, which was quite popular and had a simple and vigorous style. The Linben of Zhao Mengfu in Yuan Dynasty and Song Ke in Ming Dynasty is very famous, and the ink calligraphy is vigorous and clear, which is suitable for taking the method. -"Appreciation of Ancient Inscriptions" is the most famous in Songjiang. This post is simple, dignified, more subtle and more official. Clear pronunciation and mellow voice, strict statutes. From beginning to end, the breath is simple and gentle, calm and happy. For those who love Cao Zhang, this is an excellent model to learn from Cao Zhang.