Abstract: Taking a coal mining subsidence area in northern Peixian County as the research object,thewater quality indexes during the wet and dry seasons were analyzed. The water body was comprehen-sively evaluated by single factor evaluation method,comprehensive pollution index method,graded eval-uation method and comprehensive water quality identification index method. The results show that theaverage values of comprehensive water quality identification indexes during the wet and dry seasons are4.204 and 3.477,respectively. In most periods,the water body meets the Class IV and V standards. Thewater pollution is more serious in the summer wet season. Due to climatic characteristics and pollutionsources such as domestic sewage,industrial wastewater and agricultural wastewater,the main pollutantsin the water body of the subsidence area are COD,TN and TP,with the maximum concentrations of64.71,3.320 and 0.640 mg /L,respectively,which are inferior to the Class V standard. Close-