Zhangjiagang City, a county-level city in Jiangsu Province, is managed by Suzhou City. It is located in the east of Chinese Mainland, on the south bank of the lower reaches of the Yangtze River. It is connected to Changshu in the southeast, Suzhou and Wuxi in the south, Jiangyin in the west, and the Yangtze River in the north. It faces Rugao and Jingjiang across the river, with a total area of 999 square kilometers, including 777 square kilometers of land area and 195.67 square kilometers of water area. It has jurisdiction over 3 streets, 7 towns and 7 functional areas.

Zhangjiagang City, formerly known as Shazhou, was abolished in September 1986, and Zhangjiagang City was established after Zhangjiagang, a natural port in the territory. The natural environment in the territory is superior, with scenic spots such as Xiangshan Mountain, Jiyang Lake, Phoenix Mountain, Yonglian Town, etc. In October 2020, it was rated as a national model city (county) for mutual support.

By the end of 2021, Zhangjiagang has a permanent resident population of 1.4404 million. In 2021, Zhangjiagang City will achieve a GDP of 303.21 billion yuan, of which the added value of the primary industry is 2.975 billion yuan, the added value of the secondary industry is 155.088 billion yuan, the added value of the tertiary industry is 144.958 billion yuan, and the proportion of the tertiary industry is 1.0:51.2:47.8. According to the resident population, the city's per capita GDP is 211000 yuan.