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In order to improve urban water environment project investment benefit, it is necessary to evaluate the performance of the project systematically and comprehensively. The paper takes advantage of Dempster- Shafer (D-S) evidential theory and triangle whitening function in data processing and data integration to construct the evaluation model. Firstly, the triangular fuzzy number is used to determine the indicator weight. Then the grey clustering matrix is constructed to determine the level ofdoi:10.3303/cet1651044 doaj:bb29ad99b21e4630b8edf653603162ed fatcat:sqeeqaseuzazzgeoy6l4yolhqi