Huai Su, the date of birth and death is not allowed. Yi Shuo was born in the 13th year of Kaiyuan (725) and died in the 9th year of Yuanhe (785). The word hides the truth, the common surname is money, and then he became a monk. Yongzhou Lingling (now Changsha, Hunan) people. After moving to Beijing. Good drinkers are called drunken monks, and together with Zhang Xu, they are called "drunkards". Compared with Zhang Xu, Huai Su has a thick book and a thin book. People describe his cursive script as "walking on a snake" and "a whirlwind of showers".
There are many works handed down from ancient times by Huai Su, among which Autobiographical Post is the most representative. Others include eating fish posts, discussing books posts, bitter bamboo shoots posts, and cursive scripts. Autobiographical Notes, written in the 12th year of Dali (777), is extremely wonderful. "Eating Fish Post" is also a masterpiece. The post says "Old Monk" and should be a work in his later years.