Chengdu is a prefecture-level city under the jurisdiction of Sichuan Province, referred to as "Rongcheng and Jincheng" for short. It is the capital of Sichuan Province, a sub-provincial city, a mega-city, the headquarters of the western theater, an important national high-tech industrial base, a commercial logistics center and comprehensive transportation hub determined by the State Council, and an important central city in the western region.

In 20 18, the city administered 20 districts (cities) and counties, Chengdu High-tech Zone and Tianfu New District, with an area of 14335 square kilometers, permanent population of 1633 million and GDP of1534277 billion yuan.

Chengdu is located in the west of Sichuan Basin, on the eastern edge of Qinghai-Tibet Plateau, bordering Deyang in the northeast, ziyang in the southeast, Meishan in the south, Ya 'an in the southwest and Aba Tibetan and Qiang Autonomous Prefecture in the northwest. Geographical location is between10254 ′ ~10453 ′ and 30 05 ~ 3126 ′ north latitude. In 20 16, the city's land area was 14335 square kilometers, and the urban area was 424 1.8 1 square kilometers, of which the built-up area was 837.27 square kilometers.

Chengdu has a subtropical monsoon climate, with early spring, hot summer, cool autumn and warm winter. The annual average temperature is 16℃, and the annual rainfall is about 1000 mm. A remarkable feature of Chengdu's climate is cloudy and short sunshine time. The folk proverb "Shu dog barks at the sun" is an image description of this climate feature.

Another notable feature of Chengdu's climate is humid air. Therefore, although the temperature is not high in summer (the highest temperature generally does not exceed 35℃), it looks sultry. The average temperature in winter is above 5℃, but it is very cold because of cloudy days and humid air. The rain in Chengdu is concentrated in July and August, and there is less rain and less ice and snow in winter and spring.

Chengdu has various types of land. According to landform types, it can be divided into plains, hills and mountains; According to the soil type, it can be divided into paddy soil, fluvo-aquic soil, purple soil, yellow soil, yellow brown soil, etc. 1 1; According to the present situation of land use, it can be divided into eight categories: cultivated land, garden land and grassland. The proportion of plain area is remarkable, reaching 497 1.4 square kilometers, accounting for 40. 1% of the city's total land area, far higher than the national level of 12% and that of Sichuan Province of 2.54%.

Hilly areas account for 27.6% and mountainous areas account for 32.3%; The land reclamation index is high. Fertile land, deep soil layer, mild climate and convenient irrigation. The proportion of usable area can reach 94.2%, and the average land reclamation index of the whole city reaches 38.22%, of which the plain area is as high as 60%, far higher than the national 10.4% and Sichuan10/0.5% levels.