Cai Xiang studied calligraphy with Wang Xizhi, Yan Zhenqing and Liu Gongquan. When the predecessors commented on Cai Xiang's calligraphy, they all thought it was "similar to Jin and Tang Dynasties". His running script "Cheng Xin Tang Zhi Ji" can be said to be the most typical and representative work in Cai Xiang ink painting handed down from generation to generation, following the style of Jin and Tang Dynasties. Letters was published in Guimao, when Cai Xiang was fifty-two. It was his masterpiece advocating the wind of emphasizing the end in his later years.
After regular script entered the Song Dynasty, Cai Xiang should be the first person to write regular script in the Song Dynasty. Zhou Jin Tang Ji is the representative work of Cai Xiang in block letters. This painting was written by Cai Xiang for Han Qi. In order to show respect for Han Qi, Cai Xiang was ingenious in his creative process, writing every word dozens of times, and choosing the best words for splicing. Therefore, "Zhou Jintang Ji" is also known as the "Baique Monument". When a complete work is written separately, the echo between words and the coherence of composition will be destroyed, so "Ji Jin Tangji" is mixed. The words are perfect, but the overall arrangement has the shortcomings of looking around and being absent-minded