In 3 16 BC, Shu was destroyed by Qin, and Shu county merged with Chengdu county, which was the beginning of the establishment of Chengdu and the beginning of its accurate historical calendar. In 3 1 1 BC, the King of Qin ordered the capital to be established, and Chengdu was planned according to the pattern and organizational system of Xianyang, Qin Dou. This is the beginning of Chengdu urban planning and construction with a history of more than 2,300 years.

For more than 2,000 years from the pre-Qin Dynasty to the Qing Dynasty, Chengdu has been the governing place of counties, prefectures, prefectures, roads, roads and provinces, and has successively become the capital of seven local governments: Dacheng, Han Shu, Han Cheng, Qianshu, Houshu, Dashu and Daxi.

Other organizational names have changed, but the name of "Chengdu County" has not changed for more than 2,000 years, and the urban area of Chengdu has always been under the jurisdiction of "Chengdu County". In the 17th year of Tang Zhenguan (643), Huayang County (formerly known as Shu County) was established in Chengdu County. Since then, Chengdu has been jointly managed by two counties.

Chengdu people 4500 years ago:

Baodun people established their own city in Chengdu Plain. They built tall walls to resist wild animals and floods, and there were exquisite moats around the walls to drain and flood. All these indicate that the floods in the ancient Chengdu Plain were very serious.

As an early "Chengdu people", Baodun people cultivated rice as their staple food and tamed wild boar and sheep to start animal husbandry. In their spare time, Baodun people will make an appointment with three or five friends and drive a boat to catch shrimps and crabs in the river at their doorstep.

Baodun people give full play to their talents and transform their homes when fighting against nature.

Limited by knowledge, Baodun people used carefully polished stone tools for hunting and farming, and lived in houses built with wooden or bamboo bones and mud walls. Wealthy families can also use exquisite pottery to cook and hold things in daily life.