Huairou Reservoir is one of the main water conservancy projects in the suburbs of Beijing. It is located in Huairou County, Beijing, with a storage area of 12 square kilometers and a total storage capacity of 100 million cubic meters. The dam was started on March 9, 1958 and completed on July 19, 1958, lasting 130 days. After the heightening of the main dam in 1990, the total storage capacity is 140 million cubic meters.

The water of the reservoir comes from the tributary of Chaobai River. After the completion of the reservoir, in addition to normal functions of flood control and water storage, it will become an important source of water in Beijing and an important part of the South to North Water Diversion Project.