The benefit evaluation of tailings reservoir reclamation is an important part of the theoretical research and practice in mine land reclamation.Take tailings reservoir reclamation project in Pingguo aluminum mine as an example,a index system for the benefit evaluation of tailings reservoir reclamation was established from the three aspects of economic benefit,social benefit as well as ecological and environmental benefits,the comprehensive benefit evaluation of the reclamation project was evaluated by fuzzy comprehensive evaluation method.The result showed that the comprehensive evaluation level of tailings reservoir reclamation project in Pingguo aluminum is " satisfactory",its social benefits,economic benefits and ecological benefits are relatively obvious,overall,the project can achieve a good comprehensive benefit.