In the first year of Jianli (A.D. 12 1 1 year), Master Rong wrote Tea for Health, which was his last work in his later years.

Although tea was introduced to Japan as early as Nara Dynasty, it was not popular. Because Rongxi brought back tea seeds from the Song Dynasty and planted them in Beizhen Mountain and Hakata Fu Sheng Temple in front of the building, and presented three highly variable seeds planted in the mother's tail, they were planted in Yuzhi Tea Garden soon, gradually making tea planting more extensive, so Rongxi was honored as "the tea ancestor of Japan".