We know that Kaiyuan Bao Tong originated from Ou Yangxun's calligraphy, and there are historical records on whose calligraphy Kaiyuan Bao Tong was created.

Song Taizong Zhao Huan (939-997) wrote Chunhua Yuanbao, a real cursive three-body Qian Wen, which opened the end of imperial calligraphy. Five years later, I personally wrote "Supreme Treasure", and the original book style is Li Yi, full and full, subtle and dignified; Running script is clear, meaningful and smooth; Cursive script flying, quite skilled.

Chong Ning Bao Tong and Daguan Bao Tong are both books written by Song Huizong. Hui Zong is proficient in calligraphy and painting, especially the "iron wire style", also known as the "thin gold style". Iron-painted silver hooks, vigorous and powerful, are unique in the history of calligraphy in China. These two kinds of coins are well preserved and easy to collect, and are deeply loved by ancient coin lovers and calligraphy lovers.

Yuanfeng Bao Tong was cast in the first year of Yuanfeng in Song Shenzong (1078), and there are many versions. Among them, Qian Wen, the official script of Yuanfeng Bao Tong, is calm and vigorous, and is known as "Dongpo Yuanfeng" in the history of coins. According to legend, it was written by Su Shi.

Song Zhezong Yuan You period (1085-1093), Sima Guang and Su Shi both wrote "Yuan You Bao Tong". The style of writing is unrestrained and eclectic, with a sense of transcendence.