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Aiming at the rough problem of Identical-Discrepancy-Contrary (IDC) comments in Set Pair Analysis (SPA), this study proposed an improved SPA to deeper characterize the difference and opposites coefficient, and to extend the evaluation ranking of dam-break environmental impact assessment from 3 levels to 5 levels and then established dam-break environmental impact assessment model based on the General Set Pair Analysis (GSPA). The model was applied to Shaheji Reservoir dam. Compared with traditional SPA method, fuzzy mathematical model showed that the evaluation results of GSPA are reliable, reasonable and visualized and then can obtain the convergence degree of each evaluation level. It is a scientific and practical evaluation method for evaluation and decision-making of the dam-break environmental impact assessment and has good potential application. [ABSTRACT FROM AUTHOR]