Changzhou, referred to as "Chang" for short, also known as Longcheng, is a prefecture-level city under the jurisdiction of Jiangsu Province, a city in the central area of the Yangtze River Delta, and a type I large city. It is located in the south of Jiangsu Province, on the west bank of Taihu Lake, adjacent to Wuxi City in the east, bordered by Nanjing City and Zhenjiang City in the west, bordered by Wuxi City and Xuancheng City in Anhui Province in the south, and located in the lower reaches of the Yangtze River Plain, with both high sand plains and hills and lakes, which belongs to the north subtropical humid monsoon climate; It has jurisdiction over 5 districts and 1 county-level city, with a total area of 4385 square kilometers; By the end of 2021, Changzhou has a permanent population of 5.3496 million.

Changzhou is an important city in the Shanghai Metropolitan Circle and the Suzhou-Wuxi-Changzhou Metropolitan Circle, one of the central cities in the Yangtze River Delta, an advanced manufacturing base and a famous cultural tourism city approved by the State Council; It is a famous historical and cultural city in China. It has been the county, state, road and government offices in all dynasties. It has had the names of Yanling, Piling, Pitan, Jinling, Changchun, Taizhou and Wujin. It was named Changzhou in the ninth year of Emperor Wen's reign of the Sui Dynasty (589); Changzhou is an excellent tourist city in China, represented by scenic spots such as Yancheng Tourist Area in the Spring and Autumn Period, Tianning Temple, Maoshan, Universal Dinosaur City, Hongmei Pavilion, and Wenbi Tower. In addition, there are more than 30 former residences of celebrities such as Qu Qiubai, Zhang Tailei, Tang Jingchuan, Yun Nantian, Huang Zhongze, Zhao Yi, Li Boyuan, Li Gongpu, and Shi Liang. The existing classical gardens include Near Garden, Yue Garden, Yi Garden, Temporary Garden, and Wei Garden.

In 2021, Changzhou's GDP will reach 880.76 billion yuan, an increase of 9.1% over the previous year at constant prices.