Application research of two-stage method in evaluation of mine ventilation system

The paper analyzed principle of two-stage method, and took index system optimizing of a mine ventilation system as study object, used two-stage method to calculate its index weights. It did contrastive analysis of two-stage method and analytic hierarchy process, and the results showed that the two methods got the same sequence of importance of the index weights, and the two-stage method has high reliability and simple calculation process.