Calligrapher Ou Yangxun left a story about washing pens in Shutangshan in the north of Changsha. Shutangshan is located in Wangcheng District, Changsha City, Hunan Province. It was named after Ou Yangxun's hard practice of calligraphy here. There are still relics such as Ou Yangxun's reading place and pen washing place. Ou Yangxun is famous for his outstanding achievements in calligraphy, especially the art of regular script, which has had a far-reaching impact on the development of calligraphy art in China.