The　rotating　blade　is　simplified　as　a　rotating　cylindrical　panel　with　a　presetting　angle　and　a　pretwist　angle.　Nonlinear　dynamic　behaviors　of　the　rotating　cylindrical　panel　under　higher-frequency　primary　resonance　and　lower-frequency　primary　resonance　in　the　presence　of　1:2　internal　resonance　are　discussed.　We　use　the　Green　strain　tensor　to　derive　an　strain-displacement　relationship.　Based　on　the　first-order　shear　deformation　theory,　Hamilton　principle　and　Galerkin　method　is　utilized　to　acquire　nonlinear　ordinary　differential　equations　of　the　system,　which　contains　coupling　between　linear　stiffness　terms　of　the　two　transverse　modes.　The　modulation　equations　are　obtained　by　using　the　method　of　multiple　scales.　Matcont　package　is　used　to　portray　frequency-amplitude　response　curves　and　force-amplitude　response　curves　of　the　system　under　higher-frequency　primary　resonance　and　lower-frequency　primary　resonance.