In　this　paper,　nonlinear　finite　element　method　was　used　to　numerically　simulate　a　rubber-steel　sphere　bush　subjected　to　torsional　load　with　an　elliptical　surface　crack　in　the　middle　rubber　layer.　The　relationships　between　torsion　stiffness　and　deformation　have　been　gained　when　large　torsion　deformations　are　imposed.　The　results　indicate　that　torsional　stiffness　decreases　as　deformation　increases.　For　a　small　crack,　the　influence　of　crack　length　on　torsional　stiffness　is　very　small,　and　the　torsional　stiffness　is　changeless　on　the　whole.　The　relation　curves　between　tearing　energy　and　crack　depth　have　been　given,　so　have　the　relation　curves　among　tearing　energy,　load　and　thickness　of　the　rubber　layer.　The　results　indicate　that　tearing　energy　increases　as　load　increases　but　decreases　as　thickness　of　the　rubber　layer　increases.　For　an　elliptical　surface　crack　in　the　middle　rubber　layer,　tearing　energy　increases　and　then　decreases　as　crack　depth　increases.　According　to　the　data,　we　can　get　the　experimental　formula　by　multiple　non-linear　data　regression.