Stream water quality evaluation method based on comprehensive index of macrobenthonic animals

The invention discloses a stream water quality evaluation method based on comprehensive indexes of large benthonic animals, and relates to the technical field of water quality detection, and the method comprises the following steps: S1, sampling benthonic animals; s2, sample identification; s3, measuring physical and chemical indexes; s4, dividing functional characters; s5, calculating a functional diversity index; s6, calculating a community diversity index; s7, correlation analysis and screening; and S8, performing evaluation grade division. According to the stream water quality evaluation method, stream water quality biological evaluation is carried out in a mode of combining the Shannon-Wiener index H'with the functional diversity index and the physicochemical index, the evaluation method considers response of community structure and function change to environmental influence at the same time, and the structure and the function of a stream ecosystem can be comprehensively represented; and the stream water