Combined with the pit prospecting engineering of Badao gold deposit in Yanji City,the 3D solid models of the tunnel are established by using the FLAC3D software,the stress distribution regularities of the tunnel surrounding rock,the deformation displacement,the plastic area distribution and the stability of surrounding rock etc.are analyzed comprehensively.The tunnel deformation of the site where is excavating is monitored according to the results of analysis,which provides a certain reference for excavating tunnel safety and timbering schemes.