The first customs in the world, Shanhaiguan, was the Ming Dynasty Hongwu 14 years, Xu Da was ordered to repair Yongping, Jieling and other customs, here to create a pass, because it is based on the mountains and the sea, so the name Shanhaiguan, anciently known as "Shaoguan", also known as "Shaoguan", also known as "Linyiguan".