A　simplified　method　for　in-plane　buckling　analysis　of　pylons　of　multi-span　suspension　bridges　was　proposed.　The　analysis　model　is　a　pylon　with　an　equivalent　spring　connected　to　it　at　the　saddle.　The　stiffness　of　the　equivalent　spring　was　derived　from　the　relation　of　the　horizontal　displacement　at　the　saddle　and　restoring　forces　from　the　cables　and　was　expressed　with　a　simple　formula.　The　stiffness　of　the　deck　is　considered　also　in　the　simplified　method.　This　method　is　suitable　not　only　for　three-pylon　suspension　bridges　but　also　for　the　suspension　bridge　with　multiple　pylons.　The　example　of　the　Taizhou　Bridge　with　two　span　length　of　2x1080m　and　three　pylons　indicates　that　the　equivalent　spring　stiffness　under　different　load　case　is　not　significant　for　a　large　span　suspension　bridge　and　the　equivalent　spring　stiffness　of　mid-pylon　is　very　small　comparing　with　the　side　pylons,　and　the　buckling　problem　of　mid-pylons　will　be　more　important　than　side　pylons　for　a　continuous　suspension　bridge　with　multiple　pylons.