Non-linear　finite　element　method　has　been　employed　to　analyse　cylindrical　rubber　bushes,　a　bonded　layer　of　vulcanized　rubber　separating　two　concentric　rigid　(typically　steel)　tubes,　when　large　torsional　strain　were　imposed.　Values　of　torsional　stiffnesses　have　been　calculated　for　various　sizes　of　bush.　The　torsional　stiffness　of　a　bush,　which　is　not　constant　for　large　strains,　discreases　with　increasing　strain.　However,　the　torsional　stiffness　doesn＇t　vary　by　more　than　about　+/-　3%.　FEA　results　indicates　that　the　relationship　between　torsional　stiffness　and　bush　length　is　linear　not　only　for　small　torsional　strains　but　also　for　large　ones.　The　torsional　stiffnesses　of　bushes　which　have　the　same　outer　radii　are　sensitve　to　the　ratio　of　inner　radius　to　outer　radius.　Stiffnesses　increase　as　the　inner　radius　discrease　when　outer　radius　is　constant.　Emperical　formulas　of　torsional　stiffness　were　regressed　according　to　data　predicted　by　FEA　using　regression　tool　software,　and　the　torsional　stiffnesses　calucated　from　the　emperical　formulas　are　agree　with　the　result　of　finite　element　analysis.