Abstract: In order to use Karst underground water to alleviate the water resource shortage of Longtan town and Mawang town of Youyang county in Chongqing, based on the hydrogeological survey, eight wells are arranged in the selected drilling target area (single well designed)to carry out steady flow pumping test.The hydrogeological parameters and the maximum water yield of the water supply well are analyzed, and the water quality is evaluated.The research shows that the output of eight wells all meet the standard well requirements, and the total amount of recoverable water is suggested to be 2 050 m³/d.Except ZK8, water from other wells can be used as drinking water source after treatment.