The trade between Japan and Sung Dynasty in China continued until the end of Southern Sung Dynasty and as the Hojo clan, which became a regent of bakufu for generations, also protected Rinzaishu sect, many Zen monks from Sung came to Japan on trading vessels and the mutual visits continued even after the attack on Southern Sung Dynasty by the Mongolian Empire shifted into full swing.
日宋貿易は南宋代の終わりまで行われ、幕府の執権を代々つとめた北条氏も臨済宗を保護したため、宋の禅僧も数多く貿易船に便乗して来日し、モンゴル帝国による南宋攻撃が本格化してからも往来は継続した。