Regarding　the　pending　problem　of　reasonable　transverse　and　longitudinal　spacing　during　the　design　and　construction　of　the　interchange　tunnels　of　urban　underground　road　in　Beijing,　and　using　a　3-lane　tunnel　as　an　example,　the　deformation　law　and　stability　characteristics　of　surrounding　rocks　under　30　kinds　of　working　conditions　(5　kinds　of　longitudinal　spacing　and　6　kinds　of　transverse　spacing)　are　analyzed　using　a　numerical　simulation　method　based　on　an　hierarchical　generalized　model　of　geological　conditions　in　the　Beijing　area.　The　influence　law　of　transverse　and　longitudinal　spacing　on　ground　settlement,　tunnel　displacement　at　the　interchange　and　plastic　zone　is　deduced.　Recommended　values　for　reasonable　spacing　in　the　transverse　and　longitudinal　directions　and　the　reinforced　support　zone　are　proposed　for　underground　interchange　tunnel.　Results　show　that　the　transverse　spacing　has　significant　effects　on　the　ground　deformation　of　interchange　tunnels,　and　the　spacing　should　be　greater　than　1　time　the　tunnel　diameter　(1D);　moreover,　no　matter　how　great　the　transverse　spacing　is,　the　area　affected　by　interchange　tunnel　construction　is　concentrated　in　a　circular　region　in　a　distance　3　times　the　tunnel　diameter　(3D)　from　the　center　of　the　interchange.　©　2015,　Editorial　Office　of　＇Modern　Tunnelling　Technology＇.　All　right　reserved.