Qüxü County, or Qushui or Chushur or Chushul, is a county in the Lhasa prefecture-level city southwest of the main center of Lhasa, Tibet, China. It is mountainous in the northwest, flatter near the Lhasa River, which runs through the east of the county, and the Yarlung Tsangpo, which forms the southern border. The population as of 2000 was 29,690, mostly engaged in agriculture or animal husbandry.