In this study,three evaluation methods(i.e.single factor evaluation method,comprehensive pollution index method and Spearman rank correlation coefficient method)were used to evaluate the water quality condition of the Key river basins Daheihe River and Hunhe River in Hohhot section of the Yellow River according to the monitor-ing data of the state-controlled examination sections during 2016 to 2023.There result showed that the overall water quality of the Daheihe River has improved yearly,and that of the Hunhe River has improved significantly.The three methods are the organic combination of qualitative and quantitative evaluation,and the evaluation results are basical-ly consistent.
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