[Objective] In recent years

environmental problems caused by coal and other construction projects have become the focus of the whole society

while evaluating the benefit of ecological restoration in construction projects and quantifying the effect of soil and water conservation in the construction projects can provide reference for the construction project evaluation in the future.[Methods] Taking resource integration project at Yongxing coal mine in Zichang County

Shaanxi Province as an example

the benefit evaluation system of soil and water conservation and ecological restoration for construction projects has been established

the values of different evaluation indexes in different construction periods have been scaled

the weights of the indexes which are calculated by the principal component analysis and the analytic hierarchy process method have been synthesized according to the Lagrange multiplier method

and the benefit index is finally used to make a comprehensive analysis of the environmental benefits of ecological restoration.[Results] The comprehensive weight calculated by the Lagrange multiplier method

which considers the subjective and objective information

can reflect the characteristics of the different indexes in the construction projects during each construction period. The ecological benefit index based on the comprehensive weight calculation shows that the ecological benefits index of this project in the early stage is the highest

while the ecological benefit index of the trial operation period is 0.392

which is higher than the construction period 0.318. The ecological restoration project began to play the role of soil and water conservation in the trial operation period.[Conclusion] The evaluation system and evaluation method of ecological restoration benefit proposed in this paper are feasible

which can provide a certain reference for other production and construction projects.