Yanchang County, belonging to Yan'an City, Shaanxi Province, is located in the north of Shaanxi Province, east of Yan'an City, with an east-west length of 73 kilometers and a north-south width of 55 kilometers, with a total area of 2,368.7 square kilometers. It has 1 street and 7 towns under its jurisdiction. According to the seventh census data, as of 00:00 on November 1, 2020, the resident population was 117,965 people. Early human activities in Yanchang County can be traced back to the Neolithic Age. In the second year of Tai Shi (266) of the Western Jin Dynasty, the county's founding was established. After several changes, in the second year of Tang Guangde (764), because the Yanhe River flows into the Yellow River from the west to the east of the county boundary, it was named Yanchang County, which is still in use today. The terrain is tilted from northwest to southeast, high in the north and south, low in the middle, valley peak type. Warm temperate arid continental monsoon climate, spring, summer, fall and winter seasons, cold, warm, dry and wet obviously. In 2022, Yanchang County realizes a gross regional product of 7.608 billion yuan, of which: the primary industry realizes an added value of 1.798 billion yuan, the secondary industry realizes an added value of 3.361 billion yuan, and the tertiary industry realizes an added value of 2.449 billion yuan.