In　order　to　make　scheme　comparison　of　cable-stayed　bridges　convenient,　the　reverse　double-mass　model　for　full　floating　cable-stayed　bridges　and　the　double-mass　model　for　fixed　hinge　cable-stayed　bridges　were　developed,　and　based　on　the　simplified　models,　the　formulas　were　derived.　Then,　on　the　basis　of　the　double-mass　models　and　the　response　spectrum,　the　simplified　calculation　of　the　bottom　bending　moment　and　simplified　criterion　of　low　gravity　center　cable-stayed　bridges　were　put　forward.　Finally,　the　proposed　models　and　simplified　calculation　were　evaluated　by　the　tests　on　ten　built-up　bridges　and　the　simplified　calculation　results　were　matched　well　with　those　analyzed　by　finite　element　method.　The　results　show　that　the　two　simplified　models　have　higher　accuracy　and　the　criterion　of　low　gravity　center　cable-stayed　bridge　is　reliable,　they　can　be　adopted　in　preliminary　design　and　scheme　comparison　of　cable-stayed　bridges.　©　2018,　Central　South　University　Press.　All　right　reserved.