Dayi county is situated in the west of Chengdu plain with total area of 1327 square kilometers.It borders on Qionglai Moutains, and adjoins Chongzhou city in the east, Xinjin county in the southeast, Qionglai city in the southwest, Lushan county and Baoxing county of Yaan city to the west, and Wenchuan county of Aba Zhou. In the 2nd year (AD 671) of Tang Xianheng, the west part of Jinyuan county was separated and renamed as Dayi county. Taiping World-wide Record records that: the word "Yi" means vast, so the name of the county was called Dayi. That is the origin of its name. In 1284 (the 1st year to the 21st year), Anren county and Huojing county were taken withdraw and their administrative region were put into Dayi county. In the 10th year (1377) Ming Hongwu, Dayi was taken withdraw and was incorporated into Qiong county. In the 13th year (1380), it was reestablished. Dayi county is back against mountain Longmen and facing to Chengdu plain. Since the ancient time, Dayi county has kept its culture developed, landscape beartiful, culture relics bright.