The　structural　system　with　better　seismic　performance　is　one　of　the　key　to　the　seismic　design　of　cable-stayed　bridges.　The　research　shows　that　the　internal　force　response　of　floating　system　is　small　and　the　displacement　response　is　large,　and　the　seismic　response　of　the　hinged　system　is　the　opposite.　However,　the　tower　bottom　moment　of　the　fix　hinged　cable-bridge　could　be　less　than　it　of　the　floating　system　actually,　because　the　inertia　force　of　the　girder　in　the　hinge　system　would　be　transmitted　to　the　tower　through　the　connection　of　tower　and　girder.　In　the　light　of　these　characteristics,　a　new　low-gravity　cable-stayed　bridge　seismic　structure　system,　the　safebelt　constraint　system,　is　proposed　in　this　paper,　and　the　seismic　response　characteristics　are　studied　by　ANSYS.　In　addition,　the　effect　of　safe-belt　parameters　on　the　vibration　reduction　effect　of　the　belt　system　cable-stayed　bridge　is　analyzed.　©　JVE　INTERNATIONAL　LTD.