《明史·列传·卷二百一十五》
开市贸易的那天，来的人要以三百人驻在边关外，我们派五百名士兵驻扎在市场内，开市日期为一个月。至于市场，陕西三个边关原来立有场堡，大同应设在左卫北部威远堡的边关外，宣府应设在万全右卫、张家口边关外，山西应设在水泉营边关外。
开市日，来者以三百人驻边外，宣府应于万全右卫、张家口边外，山西应于水泉营边外。
On the day of opening trade, the incoming personnel shall be stationed at the border with 300 people, and we shall send 500 soldiers to be stationed in the market. The opening date shall be one month. As for the market, the three border passes of Shaanxi had originally established camps, and Datong should be established outside the border of Weiyuanbao in the northern left guard; Xuanfu should be established outside the border of Wanquan Right Guard and Zhangjiakou; Shanxi should be established outside the border of Shuiquanying.