Abstract: Based on the specific mining environment of the transition from open-pit to underground in Shirengou mining model，the AHP and the Fuzzy mathematics methods fundamental theory were used to make a synthetic assessment.During this process，lots of dynamic and static，fix and non-fix quantified influence factors working on the mining method were taken into synthetic account，such as the technical and economic factors and degree of slope stability etc.The influence factor indexes of the mining methods were transformed into the matrix of the membership degrees；the weight of the influence factors matrix was established according to the AHP method.With the weights matrix and the matrix of the membership degrees，the Fuzzy synthetic judge model was established，and the synthetic superior degree of the mining methods based on the influence factors was got by the numeration with the Fuzzy mathematics methods，so the third mining model comes to the first place.

Key words: Transition from open-pit to underground mining, Mining model, AHP, Fuzzy synthetic judge