Ou Yangxun's calligraphy is characterized by rigorous regular script and precipitous brushwork, which is unparalleled in the world. He is called the first regular script in Tang Dynasty. He and Yu Shinan were both famous for their calligraphy in the early Tang Dynasty, also known as "Ou Yu". Later generations saw the danger in the book, and they were the first to understand it. The name is "Oti".