After studying Buddhism in China, Japanese Zen master Rong wrote a book about making and ordering tea, which was popular in Jiangsu and Zhejiang during the Southern Song Dynasty. According to relevant public information, Japanese monks first stayed in Tiantai Mountain in Zhejiang Province or in the Tang Dynasty. After they returned to China to study abroad, they not only brought Tiantai Sect to Japan, but also brought tea varieties to Hiei Mountain in Kyoto. Later, Shang Rong also studied Buddhism and tea art in Tiantai Mountain, and wrote the famous Tea Making Record, which was popular in Jiangsu and Zhejiang provinces in the Southern Song Dynasty, and was therefore known as the tea ancestor of Japan. Later, the monks studying abroad argued with each other.