With the utilization of water quality monitoring and groundwater irrigation 31years of observations, on the basis of hydro geological system of irrigation and environmental conditions, the paper selected three typical wells to carry out groundwater quality assessment, analysis of water level and water chemistry characteristics of the dynamic elements of change law for many years to fully explore the evolution of water dynamics and water quality of natural and man-made factors. It also predicted the depth and change trend of groundwater quality of 3representative wells with the matlab gray prediction method and SPSS calculation software. The research results provide a basis for determining the rational allocation of water resources, suitable depth of groundwater, reasonable fertilization and irrigation.