Song Guang, courtesy name Changyi, was born in Nanyang, Henan Province and served as Tongzhi of Mianyang. He is good at cursive calligraphy, especially Zhang Xu and Huai Sufa, who are as famous as Song Zhen and Song Ke. "Taibai Wine Song" and "Feng Rusong Ci" are Song Guang's representative works handed down from generation to generation, all of which are written in cursive script. His cursive writing techniques are connected and he is good at creating a strong momentum through rapid writing; the structure and size of the characters are not constrained and change according to the shape of the characters, all of which are natural and vivid; the pen is skillful and graceful. There is also concern about the Er Wang Cao method. Its beautiful appearance is due to the influence of the Er Wang Chang method. However, he still aims to belong to the cursive script of the Tang Dynasty, so he can retain a certain momentum of the cursive script of the Tang Dynasty, which is rare among calligraphers who studied calligraphy since the Song and Yuan Dynasties. To a certain extent, he influenced the formation of cursive script style in the early Ming Dynasty.