This　paper　investigates　the　nonlinear　vibrations　of　the　rotating　pretwisted　cylindrical　panel　under　higher-frequency　primary　resonance　and　lower-frequency　primary　resonance　for　the　case　of　1:2　internal　resonances.　An　accurate　strain-displacement　relationship　is　derived　by　the　Green　strain　tensor.　First-order　shear　deformation　theory　and　Hamilton　principle　are　utilized　to　establish　the　partial　differential　governing　equation　of　the　rotating　cylindrical　panel.　Galerkin　approach　is　employed　to　obtain　the　two-degree-of-freedom　nonlinear　system,　which　contains　coupling　between　linear　stiffness　terms　of　the　two　transverse　modes.　The　method　of　multiple　scales　is　used　to　obtain　the　modulation　equations　for　the　amplitudes　and　phases.　Numerical　simulations　are　performed　to　show　amplitude-frequency　responses　and　bifurcation　behaviors　of　the　system.　Two　types　of　numerical　methods　are　compared　to　describe　the　amplitude-frequency　responses　of　the　system.　The　results　show　the　accuracy　of　our　proposed　method.　The　effects　of　the　detuning　parameter,　the　damping　coefficient　and　the　excitation　amplitude　on　amplitude-frequency　responses　and　bifurcation　behaviors　are　fully　discussed.