China monks' eastward crossing in the Song Dynasty mainly began in the late Southern Song Dynasty. This is closely related to the rise of Zen in Japan at that time. In Heian Japan, Tiantai Sect and Neo-Zen Sect ruled the Buddhist world. In the Kamakura era, with the rise of the samurai class and the need of the Kamakura shogunate, a new Buddhism-China Zen began to replace the old Buddhism. In the second year of Shaoxi in Song Guangzong (1 19 1), Ming 'an, a Japanese monk, went to the Song Dynasty twice to study Zen in the virtual temple in Tiantai Mountain. After returning home, he built Fu Sheng Temple in Hakata, Ren Jian Temple in Kyoto and Shoufu Temple in Kamakura, advocating Zen style. Li Zongbao celebrated for three years (1227). In the first year of Chunyou (124 1), Sun Fayuaner of Song Yongxi inherited Jingshan ... Jian Zhen was in the Tang Dynasty, and China first started from Qin Shihuang.