The　multi-pulse　heteroclinic　orbits　and　chaotic　dynamics　of　a　parametrically　excited　viscoelastic　moving　belt　are　studied　in　detail.　Using　Kelvin-type　viscoelastic　constitutive　law,　the　equation　of　motion　for　viscoelastic　moving　belt　with　the　external　damping　and　parametric　excitation　are　determined.　The　four-dimensional　averaged　equation　under　the　case　of　1:1　internal　resonance　and　primary　parametric　resonance　is　obtained　by　directly　using　the　method　of　multiple　scales　and　Galerkin＇s　approach　to　the　partial　differential　governing　equation　of　motion　for　viscoelastic　moving　belt.　The　system　is　transformed　to　the　averaged　equation.　From　the　averaged　equation,　the　theory　of　normal　form　is　used　to　find　the　explicit　formulas　of　normal　form.　Based　on　normal　form　obtained,　an　extension　of　the　Melnikov　method　is　utilized　to　analyze　the　multi-pulse　global　bifurcations　and　chaotic　dynamics　for　a　parametrically　excited　viscoelastic　moving　belt.　The　analysis　of　global　dynamics　indicates　that　there　exist　the　multi-pulse　jumping　orbits　in　the　perturbed　phase　space　of　the　averaged　equation.　From　the　averaged　equations　obtained,　the　chaotic　motions　and　the　Shilnikov　type　multi-pulse　heteroclinic　orbits　of　viscoelastic　moving　belts　are　found　by　using　numerical　simulation.　The　results　obtained　above　mean　the　existence　of　the　chaos　for　the　Smale　horseshoe　sense　for　a　parametrically　excited　viscoelastic　moving　belt.　Copyright　©　2007　by　ASME.