The　structural　system　of　cable　dome　with　span　of　71.2　m　is　employed　for　the　roof　structure　of　the　National　Fitness　Center　in　Ejin　Horo　Banner,　Inner　Mongolia.　It＇s　the　first　large-span　cable　dome　structure　in　mainland　of　our　country.　Firstly,　the　whole　finite　element　model　of　cable　dome　structure　was　established　and　subjected　to　static　analysis　under　various　design　and　normal　load　combinations.　That　the　unevenly　distributed　load　was　detrimental　for　cable　dome　structure　was　put　forward　by　analyzing　the　force-bearing　characteristics　of　cable　dome　structure　at　elastic　stage.　Secondly,　the　conclusions　were　drawn　that　the　torsional　stiffness　of　cable　dome　was　weak　and　the　membrane　can　improve　the　torsional　stiffness　effectively　by　analyzing　dynamic　characteristics.　Subsequently,　the　whole　process　of　elasto-plastic　bucking　analysis　for　cable　dome　system　was　performed　to　obtain　the　three　stages　in　the　whole　loading　process:　relaxation　of　ridge　cable,　yielding　of　loop　cable　and　breaking　of　structure.　Meanwhile　the　influence　of　geometrical　parameters　on　structural　elasto-plastic　performance　was　analyzed.　Finally,　the　design　method　of　cable　dome　structure　based　on　performance　was　proposed,　the　strength　and　deformation　performance　and　bearing　capacity　control　indexes　at　each　stage　were　put　forward.