In this study. the theoretical analysis for the behavior of steel sheet piles was carried out using the third order theory based on the Bernoulli-Euler beam theory. The governing differential equation of cantilevered sheet piles subjected to combinations of linear varying distributed earth pressure, tip concentrated load and tip couple, and its boundary conditions were derived and solved by the Runge-Kutta method and Bisection method numerically. Several numerical examples are reported such as the elastica of pile, load-deflection curves and the tip concentrated loads and the tip couples yielded the zero lateral deflections of the pile tip.