Haidong area is named after being located in the east of Qinghai Lake in Haidong area (3 pieces) of Qinghai Province. It is an area with an early development and a long cultural history in Qinghai Province. According to archaeological excavations, people lived here about 6000 years ago. Before Qin and Han Dynasties, Qiang people lived here. In BC 12 1 year, Huo Qubing, an ancient general in China, led the whole army into the Huangshui River Basin. Since then, it has been incorporated into the county system of the Han Empire. In 6 1 year BC, Zhao Chongguo, a general of the later Han Dynasty, defeated Qianling Qiang in Huangshui Valley, and called on Qiang people along the Yellow River to surrender to the Han Dynasty, and left troops to settle in Hehuang area, bringing the advanced production technology of the Central Plains here. In 397 AD, a bald part of Xianbei nationality developed and established Nanliang separatist regime, one of the "Sixteen Countries in the Eastern Jin Dynasty" in history, with its capital located in Ledu County in Haidong area today. The music capital of Sui Dynasty was Xiping County. 1949 to 1978, counties in Haidong area are directly under the provincial people's government. 197810 June19 was approved by the State Council.1979 In June, the administrative office of Haidong District, an agency of the provincial people's government, was formally established, with a prefecture level. It has jurisdiction over 8 counties including Huangyuan County, Huangzhong County, Ping 'an County, Ledu County, Huzhu Tu Autonomous County, Minhe Hui Tu Autonomous County, Hualong Hui Autonomous County and Xunhua Salar Autonomous County, with 150 townships and 2 180 administrative villages. 199965438+On February 5th, the State Council approved Huangzhong and Huangyuan counties to be placed under the jurisdiction of Xining City.