In　this　paper,　the　nonlinear　vibrations　of　a　carbon　fiber　reinforced　polymer　(CFRP)　laminated　cylindrical　shell　are　investigated　with　1:2　internal　resonance,　primary　parametric　resonance　and　1/2　subharmonic　resonance.　The　radial　line　load　and　axial　excitation　are　acting　on　the　two　free　ends　of　the　CFRP　laminated　cylindrical　shell.　The　partial　differential　governing　equations　of　motion　for　the　CFRP　laminated　cylindrical　shell　are　derived　by　utilizing　the　von-Karman　type　nonlinear　geometric　relationship,　the　first-order　shear　deformation　theory　and　Hamilton　principle.　Galerkin　method　is　used　to　obtain　two-degrees-of-freedom　nonlinear　ordinary　differential　governing　equations　of　motion　along　the　radial　displacement　of　the　CFRP　laminated　cylindrical　shell　under　the　non-normal　boundary　conditions.　The　ordinary　differential　governing　equations　are　solved　as　a　system　of　four-dimensional　average　equations　by　the　second-order　approximate　multiple　scale　method.　The　first　two　order　dimensionless　natural　frequencies　versus　the　ratio　of　length　to　thickness　L/h,　the　frequency-response　curves,　the　force-response　curves,　the　bifurcation　diagrams,　the　three-dimensional　bifurcation　diagrams,　the　maximum　Lyapunov　exponent　diagrams,　the　phase　portraits,　the　time　history　diagrams　and　the　Poincare　maps　are　obtained　by　numerical　calculations.　The　influences　of　the　radial　line　load,　the　axial　excitation　as　well　as　the　detuning　parameter　of　the　CFRP　laminated　cylindrical　shell　on　the　1:2　internal　resonant　behaviors　are　investigated.