Song dynasty: 1, first unified the right to make coins. The right to coin was controlled by the imperial court, and the private mint was severely hit. 2, unified coinage system, casting national standard currency (material, weight, composition, technology, etc. ), it is strictly prohibited to cast currency with poor quality and insufficient market value. 3. Increase the amount of coins to meet the needs of market circulation. 4. Increase the name of coins, improve the credibility of coins and prosper the coin culture. Such as: (national money, annual money, three-body money, imperial money, right money, score money, land money, back star, monthly stab green money,) and: coins with different textures: copper, iron, tin money, gold and silver money. Bao Tong, Yuanbao and Chongbao coins. All kinds of calligraphy money, especially the royal calligraphy money, Daguan Bao Tong, Jiudie Huang Zhuan Song Bao Tong, etc. Be loved by people.