Abstract: The determination of engineering treatment range of multi-goaf is an important index to evaluate the feasibility of railway line construction in mining area.By the method of field investigation,theoretical calculation of residual deformation and numerical calculation,the characteristics of surface displacement and deformation and the influence of residual deformation in multi-goaf with time are analyzed in combination with the numerical calculation of ground subsidence in the field area of quasi line selectionThe results show that the residual deformation of railway track site accounts for 2% of the deformation.There is a certain distance between the site selection and the goaf and the surface deformation is small.The residual deformation does not affect the construction of the project if the old goaf is not activated.So it is appropriate for the railway site to be constructed in general without the occurrence of new mining.The research thought provides reference for the selection and judgment of similar engineering sites.