Firstly, based on the river health evaluation theory and starting from the integrity of the river system, the river health evaluation index system is selected. Secondly, the index systems of river health assessment including river morphology, hydrological and environmental characteristics, habitat elements and human activity characteristics are determined. Thirdly, set-pair (SPA) evaluation theory and extension were dealt with, a set-pair analysis-extension coupling model is constructed. Finally, taking Huangchuan Rive as an example, the ecological health evaluation on the river channel is carried out by using set-pair analysis-extension coupling model. The results of the comprehensive evaluation using the set-pair analysis-extension coupling method is obtained through calculation. It is proved by practice that the method of river health evaluation using the coupling model of set-pair analysis and extension theory could make full use of the data transformation and extension calculation, which shows the superiority in calculating correlation degree, and could reflect the determination and uncertainty of practical problems. It is possible to comprehensively consider all relevant factors. The paper provides a new idea for solving the relevant problems and obtains more accurate conclusion.

首先，基于河流健康评价理论，从河流系统的完整性出发，选择河流健康评价指标体系。其次，确定了河流形态、水文环境特征、生境要素和人类活动特征等河流健康评价指标体系。第三，对集对(SPA)评价理论和扩展进行了处理，构建了集对分析-扩展耦合模型。最后以湟川河为例，采用集对分析-可拓耦合模型对河道进行生态健康评价。通过计算得到集对分析-扩展耦合法综合评价的结果。实践证明，采用集对分析与可拓理论耦合模型的河流健康评价方法可以充分利用数据变换和可拓计算，在相关度计算上显示出优越性，更能体现确定性。和实际问题的不确定性。可以综合考虑所有相关因素。为解决相关问题提供了新思路，得出了较为准确的结论。