Ou Yangxun was the first calligrapher in the early Tang Dynasty. His words are "vigorous and vigorous, and the statutes are strict", which is called "European style". Ou Yangxun studies books very hard. According to legend, once, he went out to read the inscription of Suo Jing, a calligrapher in the Western Jin Dynasty. At first glance, the impression is not deep; Later, he went to see it again before he realized the beauty. So, he stayed under the stone tablet for three days and carefully observed and studied. In his later years, Ou Yangxun's writing was more energetic. The Huangfu Birthday Monument in Xi 'an stele forest is his work.