Yanjin County, subordinate to Xinxiang City, Henan Province, is located in the north of Henan Province, on the north bank of the Yellow River, at 35 ° 10 ′ N and 114 ° 36 ′ E, with a total area of 886 square kilometers. It belongs to the continental monsoon climate of warm temperate zone, with four distinct seasons, cold in winter and hot in summer, cool in autumn and early in spring. As of October 2021, Yanjin County has jurisdiction over 3 streets, 4 towns, 6 townships, and Wenyan Street where the county people's government is located. By the end of 2021, Yanjin County has a population of 520000.

The summer is divided into nine states, and Yanjin belongs to Yuzhou. In 1985, Yanjin was removed from the land and set up as a city. Yanjin County is close to Beijing Hong Kong Macao Expressway, National Highway 107, Beijing Guangzhou Railway and Beijing Guangzhou High Speed Railway, and is adjacent to Longhai Railway in the south. Xinhe Dutch Railway and Jidong Expressway cross the whole territory. Seven provincial highways meet in the territory, making it one of the counties with the largest highway network density in Henan Province. Yanjin County is a national agricultural product quality safety county, a national high-quality wheat production base, and a major grain and cotton production base in China. The main scenic spots in the territory include the Forest Park along the Old Yellow River, the Tomb of Chen Yucheng, the King of the Taiping Heavenly Kingdom, and the provincial cultural relic Longevity Tower.

In 2021, the GDP of Yanjin County will reach 16.62 billion yuan, an increase of 29.3% over 2016, with an average annual growth of 5.3%.