Based on the benthic index of the biologicalintegrity (B-IBI), the the Xiangxi River system health was evaluated.
构建香溪河大型底栖动物完整性因子（B-IBI），并对香溪河河流生态系统健康进行评价；
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Two biotic indices, Biotic Coefficient (BC) and Benthic Index of BiologicalIntegrity (B-IBI), recently suggested by European and American scientists were applied and commented on this study.
Based on previous mass researches, the concepts, evaluation steps and respective characteristics of biologicalintegrity index and hydro-geomorphology evaluation method were summarized systematically.