Jingmi Channel is the main water supply to capital-Beijing. It flows across the territory dividing naturally Changping District, Haidian District, Shunyi County, Huairou County and Miyun County into mountainous area and semi-mountainous area and agricultural area. The total length is 110km. The first project of Jingmi Channel began at 1960, while the second project at 1966. Since 1961, Jingmi Channel offer 0.33billion water to Beijing. In 1985, Jingmi was ranked the first water protection area. There are more than 430 facilities on the channel. In recent years, the pollution threatens the water quality in Jingmi Channel.