It is reported in this paper that analytic potential V(a)may be extended to Taylor's series.The three anterior terms of this series may be regardes as a linear harmanic oecillation while the posterior terms as perturbation.It has been solved by means of using the method of occupied number represeutation. The equation V(x)=-V0 ch-2x/a has been solved in paper.The resent ap- porximates to perfection.It is better than the W.K.B Method

and example two is a close approximation to perfection

too.