四川省雅安市地处四川盆地西缘与青藏高原过渡带的邛崃山脉和大雪山脉中，面积1.53万平方公里，辖一区七县，人口147万。雅安是四川通往西藏、云南的门户，国道108线、318线贯穿全境，全市各区县基本做到村村通公路。因地处山区，境内山高坡陡，溪河纵横，道路大多具有路窄、坡 Ya’an City, Sichuan Province is located in the Xuan Mountains and the Great Snow Mountains in the transition zone between the western Sichuan Basin and the Qinghai-Tibet Plateau. It covers an area of ​​15,300 km2 and has a total population of 1.47 million. Ya’an Sichuan is the gateway to Tibet, Yunnan, State Road 108 lines, 318 lines throughout the whole territory of the city’s districts and counties to achieve the basic village road. Because it is located in the mountains, the territory of steep slope, the river aspect, most of the roads have a narrow road, slope