The representative works in regular script include "Jiucheng Palace Liquan Ming", "Huangfu's Birthday Stele", "Huadu Temple Stele", and running script include "Zhongni Meng Laying Post" and "Thousand-Character Essay in Running Script". He has unique insights into calligraphy and has written calligraphy treatises such as "Eight Secrets", "Teaching Secrets", "On Using the Brush" and "Thirty-Six Methods". The "Inscription on the Relics of Zen Master Huadu Siyi", "The Monument of Yu Gonggong Wen Yanbo" and "The Monument of Huangfu's Birthday
" are known as "the first regular script in the Tang Dynasty".
Both he and Yu Shinan were famous for their calligraphy in the early Tang Dynasty, and they were both called "European Yu".