Yang Yisun (1812 ~ 1881) was born in Changshu, Jiangsu Province. In the 23rd year of Daoguang (1843), he was a juren, an official in Fengyang, Anhui Province, and his father died in his hometown, so he couldn't get out.
Yang Yisun is good at seal script, and he benefited from Deng Shiru in his early years. In his later years, he studied hard on Shi Guwen and Zhong Ding characters, took their brushstrokes, sought for the square shape, and painted uneven level, which had a certain influence on later seal writers, such as Wu Changshuo and others.