Dayi belongs to Chengdu. Dayi County belongs to Chengdu, Sichuan Province, located in the west of Chengdu Plain, bordering Qionglai Mountains. Chongzhou city in the east, Xinjin County in the southeast, Qionglai City in the southwest, Lushan County and Baoxing County in Ya 'an City in the west and Wenchuan County in Aba Prefecture in the north.

Dayi is located in the transition zone from Chengdu Plain to Northwest Sichuan Plateau. The terrain is high in the northwest and low in the southeast, which gradually decreases in steps, and three terrain areas, namely mountainous area, hilly area and plain area, appear in turn, forming a landform structure of "seven mountains, one water and two fields".

An overview of the historical development of dayi.

As early as the Neolithic Age, Dayi County was colonized by human beings, and the county system was established in the Tang Dynasty in 67 1 with a history of more than 300 years. Yang Sheng 'an, the top scholar in Ming Dynasty, praised him as "Wang Xian of Shu". During the Five Dynasties and Ten Kingdoms period, Dayi County belonged to pre-Shu in 19 (907-926), post-Tang in 9 (925-933) and post-Shu in 32 (934-965). 1May, 983, Wenjiang was abolished and Dayi County was placed under the jurisdiction of Chengdu.