An　analysis　on　the　chaotic　dynamics　of　a　six-dimensional　nonlinear　system　which　represents　the　averaged　equation　of　an　axially　moving　viscoelastic　belt　is　given　in　this　paper　for　the　first　time.　We　combine　the　theory　of　normal　form　and　the　global　perturbation　method　to　investigate　the　global　bifurcations　and　chaotic　dynamics　of　the　axially　moving　viscoelastic　belt.　Firstly,　the　theory　of　normal　form　is　used　to　reduce　six-dimensional　averaged　equation　to　the　simpler　normal　form.　Then,　the　global　perturbation　method　is　employed　to　analyze　the　global　bifurcations　and　chaotic　dynamics　of　six-dimensional　nonlinear　system.　The　analysis　results　indicate　that　there　exist　the　homoclinic　bifurcations　and　the　single-pulse　in　six-dimensional　averaged　equation.　Finally,　numerical　simulations　are　also　used　to　in　the　nonlinear　dynamic　characteristics　of　the　axially　moving　viscoelastic　belt.　The　results　of　numerical　simulations　demonstrate　that　there　exist　the　chaotic　motions　and　the　jumping　orbits　of　the　axially　moving　viscoelastic　belt.