Suspend-dome　structure　system　is　adopted　in　the　roof　steel　structure　of　the　badminton　gymnasium　for　2008　Olympic　Games.　The　system　is　made　up　of　top　chord　single-layer　latticed　shells,　bottom　cable,　and　vertical　stay-strut.　During　the　design,　the　whole　finite　element　model,　including　the　roof　steel　structure　and　the　stand　structure　below,　is　established　and　subject　to　calculation　and　analysis.　Considering　the　project　importance,　structure　stress　feature,　construction　inaccuracy,　prestressing　loss,　architectural　modeling　and　construction　cost,　etc.　we　assemble　various　load　cases　such　as　dead　load,　live　load,　snow　load,　wind　load,　temperature　and　earthquake,　and　etc.　to　calculate　and　analyze　the　inner　force,　deformation　and　overall　stability　during　the　structure　construction　phrase　and　the　structure　using　phrase,　optimize　the　structural　members　insuring　the　security　of　the　whole　structure　meanwhile.　During　the　design,　the　sequential　element　activating　method　is　used　to　simulate　the　procedure　of　construction,　and　construction　simulation　analysis　is　conducted　with　the　consideration　of　the　stiffness　effect　of　the　temporary　stay.　The　three-dimensional　entity　finite　element　analysis　method　and　contact　analysis　technology　is　applied　to　calculate　the　prestressing　loss　for　the　cable-strut　joint.　In　this　paper,　non-linear　spring　system　is　used　to　simulate　the　prestressing　loss　of　the　steel　cable,　and　the　influence　of　prestressing　loss　on　the　whole　structure　is　studied.