Because　of　the　asymmetric　stiffness　of　asymmetric　cable-stayed　bridge　with　single　tower,　the　wind　induced　dynamic　responses　are　different　from　which　of　the　traditional　symmetric　cable-stayed　bridge.　Based　on　one　asymmetric　cable-stayed　bridge　with　single　tower　which　is　located　in　coastal　area,　buffeting　equivalent　static　wind　loading　(ESWL)　of　long　span　cable-stayed　bridges　was　investigated　in　depth.　Firstly,　the　dynamic　characteristics　of　the　bridge　were　analyzed　through　finite　element　method.　Secondly,　sectional　model　wind　tunnel　tests　of　the　bridge　deck　were　conducted　and　buffeting　responses　of　the　bridge　were　analyzed　through　the　buffeting　calculation　model　with　the　consideration　of　buffeting　forces　and　self-excited　forces.　On　the　basis　of　the　above　work,　a　buffeting　ESWL　calculation　method　based　on　the　mode　shapes　was　derived　by　taking　the　buffeting　response　of　the　structure　as　equivalent　object.　Finally,　the　results　of　proposed　method　were　compared　with　those　of　accurate　buffeting　response　calculation　method.　The　results　show　that　buffeting　responses　of　different　parts　of　the　bridge　can　be　simultaneously　considered　by　the　proposed　method.　Compared　with　the　method　in　wind-resistent　design　specification　for　highway　bridges　of　china,　the　proposed　method　can　represent　the　relationships　between　distribution　of　ESWL　and　mode　shapes　and　mass　distribution.　Comparing　the　results　of　the　proposed　method　and　the　extreme　values　of　accurate　buffeting　response　calculation　method,　the　errors　at　critical　nodes　of　the　bridge　deck　are　smaller　than　10%,　which　meet　the　required　accuracy　of　the　practical　engineering.　For　the　buffeting　ESWL　calculation　of　flexible　long　span　bridges,　the　proposed　method　is　recommended.　©　2016,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.