|Abstract:Understanding the dynamic variation of groundwater quality can support the analysis of groundwater quality and regional water resources allocation. The dynamic variation of groundwater were investigated based on the groundwater monitoring data from national grade monitoring wells from 2007 to 2017, and groundwater level dynamic trends and pollutants distribution characters in typical areas. The results showed that the quality of class Ⅳ and Ⅱ were mainly part of the groundwater. The number of groundwater quality of class I-III was relatively small, and the proportion was mainly decreased in recent years. The number of groundwater quality of class Ⅳ and Ⅴ were increased, especially for the groundwater quality of class Ⅳ, the proportion was increased from 40.50% to 51.145%. The mainly contaminants in groundwater were pH, Total hardness, total dissolved solids, sulfate, chloride, potassium permanganate index, iron, manganese, fluoride, ammonium, nitrate, and nitrite, the groundwater quality was related obviously with the groundwater level variation in typical areas. The study of the groundwater quality dynamics can provide support for scientific evaluation of groundwater resources, formulation of reasonable development and utilization plans of water resources, and prevention and control of groundwater pollution.