Calligrapher Cai said

There were four great calligraphers in the Northern Song Dynasty: Su, Huang, Mi and Cai. A few people think that Cai Yuan refers to Cai Jing, and later generations changed it to Cai Xiang because of its "bad word". Cai studied Cai Xiang's calligraphy with his younger brother in his early years. Xu Hao's calligraphy was loved by the gods when Sergeant Admiralty awarded the Qiantang County Commandant. At that time, the literati learned it one after another. Cai Jing also studied Xu Hao's calligraphy with Su Shi, who was exiled to Qiantang, and later learned from Shen Chuanshi and Ou Yangxun, and later changed to "two kings", absorbing the strengths of various schools and becoming a whole. His calligraphy style is charming, his words are vigorous, he is happy and calm, and he has a unique style, which is highly respected in China.