Haiyan County, subordinate to Jiaxing City, Zhejiang Province, is one of the earliest organized counties in Zhejiang Province, founded in the Qin Dynasty. Haiyan County is located in the northwest of Hangzhou Bay, 118 kilometers from Shanghai and 98 kilometers from Hangzhou. It has jurisdiction over 4 subdistricts and 5 towns. The total land area is 584.96 square kilometers and the estuary area is 537.90 square kilometers. In 2021, Haiyan County has a registered population of 383,000.

Sea salt is known as "the land of fish and rice, the house of silk, the state of rites, the place of tourism". In 1985, it was listed as the coastal economic open Zone by The State Council and is one of China's top 100 counties with comprehensive strength.
In 2021, the GDP of Haiyan County was 62.156 billion yuan, an increase of 8.3% over the previous year. The added value of the primary industry was 1.874 billion yuan, and that of the secondary industry was 36.517 billion yuan; The added value of the tertiary industry was 23.765 billion yuan, and the third industrial structure adjustment was 3.0:58.8:38.2.