Partially　cable-stayed　bridge　is　a　new　type　bridge　which　structural　system　behaves　between　common　cable-stayed　bridge　and　girder　bridge,and　its　structural　system＇s,　parametric　is　variable.　Changing　of　the　system＇s　parametric　influences　the　dynamic　response　of　the　whole　bridge＇s　structure.　The　study　is　based　on　the　important　engineering　project-Pushang　Bridge　over　Wulong　River　in　Fuzhou,which　is　an　example　partially　cable-stayed　prestressed　concrete　bridge　having　special　supporting　system.　In　vertical　sight　there　are　three　towers　and　four　spans　in　the　main　bridge,　and　each　tower　stands　at　double　side　of　the　deck.　The　middle　tower,　girder　and　pier　are　consolidated,　therefore　the　side　towers　and　piers　are　also　consolidated　but　the　girder　is　supported　on　the　piers.　The　structural　static　performance　of　partially　cable-stayed　bridge　is　analyzed.　A　three-dimensional　finite-element　vibration　evaluation　model　is　developed　to　stimulate　the　bridge,mainly　analyses　the　natural　frequency　of　vibration　and　mode　shapes　of　this　structural　system.　The　dynamic　characteristics　of　partially　cable-stayed　bridge　are　then　analyzed.　Comparison　between　common　cable-stayed　bridge　and　girder　bridge　shows　that　this　type　of　bridge　has　its　own　vibration　performance.