The nonlinear oscillations of fluid conveying pipes under parametric and external excitations were researched. The nonlinear governing equation of motion for the cantilevered pipes conveying pulse fluid with onesided harmonic external force was obtained by using the Hamilton principle, in which the nonlinear geometric deformation of the pipe was only considered. The method of multiple scales and Galerkin method were employed to transform the partial differential governing equation of motion to the average equations in the case of the principal parametric resonance1/2 subharmonic resonance and 1:2 internal resonance. The results of numerical simulation indicate that there exist the periodic motion and chaotic motion in the conveying fluid pipes under parametric and external excitation.