Yu Yi specializes in calligraphy, and now there are seven lines and six crosses of "Guli Tie" in regular script, which are included in "Chunhua Pavilion Tie". "Xuanhe Shupu" said that he was "good at cursive writing, and he competed with Wang Xizhi for the first place." It was also called "Brother Liangzhi Gui", which also has the title of the book. When he tried Xi Zhi's calligraphy, Xi Zhi replied: "The wings are over there, how can it be restored?" This is true! "Zhiyi's calligraphy is definitely superior, and he was the first to be praised by the famous calligraphers of that day. He is self-proclaimed, and his achievements cannot be pursued by those who have learned cursive script in his later years." "Bu Zheng Tie" and "Grand Event Tie" in running script.
According to "Quan Jin Wen", Yu Yi has twenty-two volumes of collected works, which also include "Biao Chen Nanyi Affairs", "Northern Expedition to Xiakou Shang Biao", "Northern Expedition Shang Shu", "With His Staff" "Teachings", "Books", "Books with Wang Xizhi", "Books with Brother Bing", "Books with Brother Bing", "Books with Yi Yinhao", "Books with King Murong Xian of Yan", "Answers to He Chongshu", "Answers" "Joining the Army in Zan", "Answer to Zhai Keng".