The　multi-pulse　orbits　and　chaotic　dynamics　of　the　cantilevered　pipe　conveying　pulsating　fluid　with　harmonic　external　force　are　studied　in　detail.　The　nonlinear　geometric　deformation　of　the　pipe　and　the　Kelvin　constitutive　relation　of　the　pipe　material　are　considered.　The　nonlinear　governing　equations　of　motion　for　the　cantilevered　pipe　conveying　pulsating　fluid　are　determined　by　using　Hamilton　principle.　The　four-dimensional　averaged　equation　under　the　case　of　principle　parameter　resonance,　1/2　subharmonic　resonance　and　1:2　internal　resonance　and　primary　parametric　resonance　is　obtained　by　directly　using　the　method　of　multiple　scales　and　Galerkin　approach　to　the　partial　differential　governing　equation　of　motion　for　the　cantilevered　pipe.　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,　the　energy　phase　method　is　utilized　to　analyze　the　multi-pulse　global　bifurcations　and　chaotic　dynamics　for　the　cantilevered　pipe　conveying　pulsating　fluid.　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　orbits　of　the　cantilevered　pipe　are　found　by　using　numerical　simulation.　The　results　obtained　above　mean　the　existence　of　the　chaos　for　the　Smale　horseshoe　sense　for　the　pulsating　fluid　conveying　cantilevered　pipe.　Copyright　©　2009　by　ASME.