《元史·本纪·卷十六》
云南行省上奏说： 叙州、乌蒙的水路险恶，船大多因破损而沉没。应当从叶稍的水驿站登上陆路，经过中庆，又经盐井、土老、必撒的各个蛮部，抵达叙州的庆符，可以修建成一条驿路，一共设立五处驿站。 
云南行省言： 叙州、乌蒙水路险恶，舟多破溺，宜自叶稍水站出陆，经中庆，又经盐井、土老、必撒诸蛮，至叙州庆符，可治为驿路，凡立五站。 
Yunnan Province reported that the waterways in Xu Zhou and Wu Meng are treacherous, and many ships sink due to damage. An overland route should be built from the Yexiao Waterway Station, and pass through Zhongqing, Yanzheng, Tu Lao, and Biesa. It will reach Qingfu in Xu Zhou. Five stations can be built along this route.