Caohejing generally refers to Caohejing Development Zone. Shanghai Caohejing New Technology Development Zone is one of the first batch of 14 national-level economic and technological development zones approved by the State Council. In 1991, it was also approved as a national high-tech industrial development zone. The total planning area of the development zone is 14.3 square kilometers.
Yancheng, belonging to Jiangsu Province, is located in the middle of the eastern coast of China, in the middle of Jiangsu Province, and is located in the north wing of the Yangtze River Delta urban agglomeration. Yancheng is the largest prefecture-level city in Jiangsu Province with a metropolitan area of 17,000 square kilometers and a permanent population of 7,227,500; of which, the city has an area of 4,921 square kilometers and a permanent population of 2.4 million people. 
Yancheng borders the Yellow Sea to the east, Nantong to the south, Southwest to Yangzhou and Taizhou to the southwest, Huai'an to the northwest, and Irrigation River and Lianyungang City to the north. The city's flat terrain, vertical and horizontal rivers, rich products, known as "the land of fish and rice," the name. Yancheng is an emerging industrial and commercial city in the coastal areas of Jiangsu Province and an important regional center city in the Yangtze River Delta.
Yancheng has the longest coastline, the largest coastal beach and the widest sea area in Jiangsu Province. It is also the home of red-crowned cranes and the hometown of Elk. It has two national nature reserves, including elk and red-crowned cranes, along the beach. “The Capital of Oriental Wetlands, Crane World of Deer”. 
The majority of the population in Yancheng is the descendants of immigrants from the south of the Yangtze River. Therefore, folk culture belongs to the traditional Jiangnan cultural category. Yancheng is also the main birthplace of Huai Opera. Ranked 57th in the 2017 China Top 100 Cities.
Haining City, located in Jiaxing City, Zhejiang Province, is located in the south of the Yangtze River Delta, north of Zhejiang Province, east of Haiyan County, south of Qiantang River, across the river from Shangyu District of Shaoxing and Xiaoshan District of Hangzhou, and to the west of Yuhang and Jianggan Districts of Hangzhou. Xiasha, Tongxiang City in the north and Xiuzhou District in Jiaxing. It is 100 kilometers away from Shanghai to the east, Hangzhou to the west and Qiantang River to the south. In 1986 the county was relocated to the city  .
The name of Haining was first seen in Yongding of the Southern Dynasties Chen Wudi (558).  Its domestic scenic spot “Qianjiang Yongchao” has been popular since the Tang and Song dynasties. It is well-known at home and abroad. “August 18 tides are spectacular and the world is not.” It still attracts guests from all directions and sees a surge of wonders.
Haining has a long history. The celebrities from all walks of life are the hometown of numerous cultural celebrities such as Li Shanlan, Wang Guowei, Jiang Baili, Xu Zhimo and Jin Yong. Haining has a clear four-year climate and is a typical Jiangnan Water Town. It is known as "the land of fish and rice, the home of silk, the hometown of talented people, the state of culture, and the capital of leather." 
Haining has a prosperous social economy and distinctive features of the private economy in the township and township areas. It is one of the bases for the leather, warp knitting, home textile, solar energy, and integrated kitchen industries throughout the country.
In the list of Forbes China's best county cities released in 2014, Haining is ranked third in Zhejiang Province and eighth in the country. It is one of the most promising cities and counties in the Yangtze River Delta Region, and it is also the most powerful city on the north bank of the Qiantang River. Strong county city. In November 2017, it won the title of National Civilized City.