Based on the engineering geological survey of the main rock groups of Jintao mining company,the RMR method is used to evaluate and classify the rock mass quality from the aspects of rock RQD value,uniaxial compressive strength,joint spacing,joint state,groundwater state and the relationship between joint occurrence and roadway axis.The research results show that the lower wall of the ore body in the survey area is generally more stable than the upper wall rock mass,and the deformation and failure of the rock mass are mainly controlled by the dominant structural plane,easily imposing a great impact on the quality and stability of the rock mass,so the support should be reinforced in the construction of mining engineering.