Youquanzi concave is a late Pleistocene and Holocene sediment concave located in the west of Qaidam Basin. Previous studies indicate that potassium, boron, lithium, sodium, magnesium from the surrounding mountains are freed by erosion and transported and accumulated into the lake region by water. Ratios of correlative elements reflect that the brine is derived from continent characteristic of lixivial water. The density and salinity of groundwater show the tendency of desalination from the west to east and hydrogeological condition shows seasonal flood and the atmospheric water are the important supply sources. The study area is a low-lying area with dominant evaporation drainage of ground water and characteristic intracontinental evaporation hydrogeology and large volume of multi-metal ion-bearing, highly concentrated brine.