Abstract: To comprehensively research the effectiveness of water environmental governance in the Mintuo river basin under the background of ecological civilization, this article builds up an evaluation index system for water environmental governance performance across four dimensions:water ecological protection and restoration, water pollution control, water resources utilization and social economic carrying capacity. First, the combined weight model which is based on grey relation analysis method and mean-squared deviation weight decision method is established. Then the dynamic performance index of water environmental of ten main cities in Mintuo river basin was estimated from 2011 to 2017 by the weighted composite index method and TOPSIS model. Finally, using ArcGIS10.5 software to visualize the spatial differentiation of evaluation results. The results show that: the performance index of water environmental governance in Mintuo river basin was increased in general under the integrated management of the water environment. Although the comprehensive level of water environmental management performance in the Mintuo river basin has gradually narrowed, there were significant difference between water pollution control and water resource utilization. Therefore, the water environment management in Mintuo river basin should focus on the control of water pollution, optimize water resources allocation and integrated management in the future.