It is an exploratory research to quantitatively identify and comprehensively assess the benefit of the urban rainwater utility(URU),which can generate results helpful for decision making on the corresponding projects.Taken the rainwater utilization project in the Wafangdian industrial district as a case study,the index system of benefit assessment for URU was structured,the URU benefits were evaluated with a multilevel semi-constructive fuzzy optimization model,and an optimal scheme was then recommended.The results indicate that the multi-level semi-constructive fuzzy optimization model well met the needs of comprehensive benefit assessment of URU.The benefits of URU could be increased with enlarged reservoir volumes and/or infiltration enhancements.