Abstract
In this paper, a new analytical approach is presented for solving strongly nonlinear oscillator problems. The iteration perturbation method leads us to a high accurate solution. Two different high nonlinear examples are also presented to show the application and accuracy of the presented method. The results are compared with analytical methods and with the numerical solution using Runge-Kutta method in different figures. It is shown that the iteration perturbation approach doesn't need any small perturbation and is accurate for nonlinear oscillator equations.