Design　aspects　of　the　Badminton　Arena　for　the　year　2008　Olympic　Games,　which　is　located　at　Beijing　University　of　Technology,　are　discussed.　The　roof　covering　the　arena　is　a　suspended　dome　spanning　98m　and　is　considered　to　be　the　widest　self-balancing　and　cable　supported　dome　in　the　world.　The　total　weight　of　the　roof　has　been　reduced　to　1200t　through　optimized　design　techniques,　and　the　adoption　of　a　cable-supported　dome　met　the　demand　of　aesthetics　as　well　as　resulted　in　steel　saving.　The　cable-supported　dome　systems　belong　to　a　group　of　cable-bar　hybrid　structural　systems,　which　consists　entirely　of　beam　elements,　bars,　and　cables.　A　sequence　of　tensioning,　over-tensioning　and　relaxing　has　been　adopted　to　reduce　influence　of　friction　and　further　meet　the　other　design　requirements.