From the end of the Heian period to the Kamakura period, "Issai-kyo Sutra in Sung Edition" was introduced to Japan through the efforts of priests who went to Sung, such as Eisai, Chogen Shunjobo and Keisei.
平安時代末から鎌倉時代にかけては、栄西、俊乗坊重源、慶政その他の入宋僧の努力で、『宋版一切経』が輸入された。