In　order　to　study　the　impact　of　different　tower　structures　on　the　longitudinal　seismic　performance　of　low　gravity　center　cable-stayed　bridge,　three　1/75　scale　models　were　designed　based　on　a　cable-stayed　bridge　with　twin　concrete　towers.　Model　1　and　Model　2　are　both　fixed-hinge　systems　but　the　main　tower　structure　is　different;　Model　1　and　Model　3　have　the　same　main　tower　structure　but　adopt　different　longitudinal　restraint　systems.　A　shaking　table　test　was　conducted　with　three　measured　seismic　waves　and　one　site　specific　artificial　wave,　and　the　seismic　response　characteristics　and　failure　mode　of　the　different　structures　of　the　main　tower　with　low　gravity　center　cable-stayed　bridge　were　studied.　The　input　peak　ground　acceleration　of　0.7g,　0.8g,　and　1.4g　correspond　to　bottom　cracks　of　one-figure　type　main　tower　of　Model　1,　obvious　cracks　in　the　down　crossbeam　of　herringbone　type　main　tower　of　Model　2,　and　serious　damage　of　main　towers　of　Models　1　and　2,　respectively.　The　lower　tower　columns　and　down　crossbeam　of　the　main　tower　of　Model　1　were　seriously　damaged,　but　damage　occurred　only　at　down　crossbeam　of　main　tower　for　Model　2.　The　above　test　shows　that　compared　with　the　one-figure　type　main　tower,　the　seismic　performance　and　post-disaster　reparability　of　the　herringbone　type　main　tower　is　better;　different　forms　of　main　towers　are　both　seriously　damaged　at　the　down　crossbeam　which　should　be　considered　in　engineering　design.　©　2020,　Editorial　Department　of　Journal　of　HEU.　All　right　reserved.