Loop　cable　tensioning　method　was　adopted　in　the　construction　of　the　badminton　gymnasium　for　2008　Olympic　Games.　Due　to　the　processing　and　installation　difficulty,　the　prestress　loss　of　cable-strut　joint　is　much　more　than　the　design　value　causing　the　unbalance　of　cable　forces.　In　this　paper,　by　coupling　the　degrees　of　freedom　of　loop　cable　joint　and　brace　strut　lower　joint　and　adjusting　stiffness　spring　element,　the　frication　sliding　of　loop　cable　is　simulated.　This　method　can　be　used　in　finite　element　model　to　simulate　accurately　the　value　of　the　prestress　loss　in　loop　cable　during　tensioning　process.　Furthermore,　the　influence　of　the　prestress　loss　on　internal　forces,　deformation　and　the　overall　stability　is　studied.　The　study　shows　that　the　prestress　loss　results　in　wide-range　change　of　the　inner　force　of　radial　tension　bars;　non-uniform　of　inner　force　of　steel　shell;　narrow　change　of　the　overall　displacement,　non-uniform　of　the　displacement　of　the　same　loop　members;　about　20%　decline　of　overall　stability.