Xihe County, subordinate to Longnan City, Gansu Province, is located in the southeast of Gansu Province, at the north end of Longnan City, and at the upper reaches of the Xihan River in the Yangtze River basin. It borders Huixian County and Chengxian County in the east, Wudu District and Kangxian County in the south, Lixian County in the northwest, and Lixian County and Qinzhou District in the northeast, with a total area of 1861 square kilometers. As of October 2021, Xihe County has 16 towns and 4 townships under its jurisdiction. 384 administrative villages and 10 communities, with a cultivated area of 870000 mu. According to the data of the seventh population census, as of 0:00 on November 1, 2020, the permanent population of Xihe County was 351069. The county people's government is located in Hanyuan Town.

According to the Unification Annals of the Yuan Dynasty, it was named He County because of the peace talks between the Song and Jin Dynasties. Because of the same name as He County in Anhui Province, the word "Xi" was added. Rich in lead, zinc, antimony, copper, gold and other mineral resources, there are 5 provincial cultural relics protection units in the territory, including Yunhua Mountain, Bafeng Cliff and Chouchi Mountain and other tourist attractions, of which the sunset lake is a national 4A tourist attraction. It is the hometown of China's Qiqiao culture. In 2020, the People's Government of Gansu Province approved Xihe County to withdraw from the poverty-stricken county sequence.

In 2021, Xihe County's GDP will reach 3.895 billion yuan, up 7.6%. Among them, the added value of the primary industry is 857 million yuan, and the added value of the secondary industry is 728 million yuan; The added value of the tertiary industry is 2.309 billion yuan, and the ratio of the tertiary industry structure is 22.0:18.7:59.3.