Abstract: Underground mining is the main way of metal mining. In the long-term mining process,the goaf and unstable areas formed need to be filled and grouted. In view of the stability evaluation of Xinli mining area of Sanshandao Gold Mine after treatment,firstly,the whole process stability of the mining area after mining and treatment is analyzed through numerical simulation. Secondly,analytic hierarchy process is used to determine the weight of many factors affecting the stability of rock mass,and the factors with greater influence are obtained as the evaluation index of D-S evidence theory to evaluate the stability of rock mass after governance. The results show that the overall deformation increases slowly after treatment,the deformation of plastic zone is in a stable state,and the filling treatment effect is good,reaching the expected effect. The treatment situation and the mechanical state of surrounding rock after treatment have the greatest impact on the stability of rock mass,followed by the stability before treatment,and the geological factors have the least impact. In the factor layer,the gob control rate has the greatest impact. D-S evidence theory proves that all levels are stable after treatment,of which -165 m level is relatively poor,followed by -240 m level.