Yu was a scholar of calligraphy and is regarded as one China’s modern masters. His works in cursive and semi-cursive manner are intensely animated. He is perhaps best known for his calligraphy and published related works on the topic. Because his later years were spent in Taiwan, his writing style is very popular and his works are considered very desirable by collectors. Yu completed numerous inkworks, stone carvings, and title plaques while living in Taipei including works for the National Museum of History, Din Tai Fung, Xingtiang Temple, and the Shilin Official Residence.