Yuan De is the currency of China, and there are three kinds: Kai, Li and Xing. Its diameter is generally between 2 cm and 2.5 cm. There are few official scripts, especially regular script and running script. Yuan De Bao Tong Xiao Ping Qian, an original collection in Shanghai Museum, is 2.4 cm in diameter and 0. 15 cm thick, with its back exposed. This money has been handed down from generation to generation. The format of Yuan De's charging treasure is double money. Qian Wen regular script, generally 2.7 cm in diameter. There are only two or three pieces in the world today, which are rare and have no pricing. One of the "Fifty Treasures of China and Gu Quan".