In this paper, Homotopy Perturbation Method is applied to solve oscillatory problems with high nonlinear terms. The available data from the Perturbation Method for the same problem is considered as a good basis for comparison between them and the results obtained from the Homotopy Perturbation Method. Although the good agreement of the data comparison shows the methods are quite equivalent, but because of the independency of Homotopy Perturbation Method to the small parameter, i.e., the limitation of Perturbation Method, makes it more effective than the Perturbation Method.