6 water quality indicators such as F-, TN, TP, etc. in water samples from 32 sampling sites in Qingshuihe river basin were monitored in April, July and November 2018, the water quality was assessed by single factor evaluation method, comprehensive pollution index method, grey correlation method and fuzzy comprehensive evaluation method, and the variation of water quality was analyzed whether F- was evaluated in the water assessment. The results showed that when F- was not evaluated, the pollution degree of monthly water quality in Qingshuihe river was July>November>April, and when 〖JP3〗F- was evaluated, the pollution degree was November>〖JP〗July>April. The results of fuzzy comprehensive evaluation were more in line with the actual water conditions. The water quality gradually deteriorated from upper reaches to down reaches of Qingshuihe river. The water quality of Qingshuihe river became worse when F- was evaluated. |