"Shu road is difficult, difficult to the sky". Since the han and tang dynasties, there are mainly three roads from hanzhong yueba mountain to bashu in xi 'an: lizhi road (hanzhong -- pyeongchang -- dazhou -- quxian) to the east. Jinniu road (hanzhong - guangyuan - mianyang - chengdu) to the west, mainly for commercial use; Zhong is mi cang dao (hanzhong - bazhong - en Yang - langzhong - chengdu).

"Cihai" records: "rice cang road, the name of the ancient road. The mi cang ancient road was opened by the ba people of the vassal states of the Yin dynasty in the late summer and early shang dynasty. It started from the present-day ba zhong of the state of Cuba and reached guliang zhou of shaanxi province (later extending to hanzhong) from the micang mountain.

The rice cang ancient road is the only sichuan-shaanxi channel before the opening of the Taurus road. It is the earliest national road in China and a very important military channel and important transportation route of food and materials in history. In 2015, the national committee of the Chinese people's political consultative conference (CPPCC) 's "shu dao cultural route" inspection team visited enyang and concluded that "enyang is the only place in China that can organically combine historical and red relics and preserve them well."

Enyang ancient town is the only ancient town to be included in the application of the micang ancient road, which is an important part of the world double heritage "ancient shu road".