Casting began in the first year of Chunhua, Taizong of the Northern Song Dynasty (AD 990). According to legend, Qian Wen wrote calligraphy for Zhao Guangyi, Song Taizong. The so-called "imperial calligraphy" can be divided into three types: truth, line and cursive script, which are read clockwise and bare-backed.

China first discovered the money of "Chunhua Yuanbao" Buddha statue in the Song Dynasty in the spring of 1988. From the physical point of view, the coin has a diameter of 24mm, a thickness of 1.2mm, a diameter of 5mm and a Buddha relief of 2 mm. Mr. Hua Guangpu, a contemporary collector, writer and coin appraiser in China, in his monograph Catalogue of Color Photographs of Ancient Coins in China.

The Song Dynasty was a very developed period of ancient metal money in China. In the early Song Dynasty, there were three kinds of "Chunhua Yuanbao": original works, lines and cursive scripts, which were written by Song Taizong himself, namely the so-called Imperial Money. Many coins of Chongning Bao Tong and Daguan Bao Tong were written by Song Huizong, which is called thin gold body. Yuan Youtong Bao's ci was written by Sima Guang and Su Dongpo.

In addition, there are many coins with various patterns or marks, such as stars, moons, suns, moons, moons and lotus patterns. There is a kind of Kaiyuan money, with a moon-leaning image and a moon-leaning image on the perforation. The source of this month's article, some people say, is that when the money was presented to the emperor, the queen pinched a nail print, but she dared not change it when minting money and left it on the back of the money.

Some people even say that this "writing on the moon" is Yang Guifei's nail mark. People in the Jin Dynasty once wrote a poem, "There is no reason to see the fall of Chai Jin, but a twist mark is hidden in Kaiyuan". Another expert believes that this is influenced by the pattern of the stars and the moon on the coins of the Western Regions, and it is the pattern or mark of the coins.