Yu Ji is a knowledgeable expert in calligraphy and painting. He is famous for his poetry and prose, and he is also known as "four masters of Yuan Dynasty" with Yang Zai, Fan Lian and Xie Qixi.
As a student in Zhao Mengfu, Yu Ji's calligraphy is not only reflected in his general ability, but also has the same origin as his teacher. Among Zhao's students, he is a typical Zhao-style figure. His cursive script and patriarchal clan system won the popularity of Jin people, but the composition was sparse and the words were peaceful, like a child. Its regular script is beautiful and ethereal, and it can be tasted by Zhong You, Lu Jianzhi and Yang Ningshi. His official script is square, leisurely and elegant. Handed down from generation to generation are Letter to Dr. Dan Qiu, White Cloud Master's Post, Han Shi, Poetry and Painting, etc.