The buried depth of the bottom plate is 19.85~34.98m, the thickness of the water-bearing sand layer is 1.45~30.05m, and the average thickness is 11.64m m. From the surface below 5~10m, it is grayish yellow and brown, mainly composed of powder, fine sand and clayey sand with thin layer of sandy clay. The sand layer has fine particles and is loose, belonging to phreatic water to weak confined water. It is replenished by atmospheric precipitation and infiltration of surface water, and has weak water enrichment. The water quality belongs to HCO 3-CA Mg type.