Abstract. We consider a nonlinear resonant boundary value problem. To prove the existence of a solution to a given boundary value problem we replace the linear part of a given equation by non-resonant linear part. First, to modify a resonant problem to a regular one we use the Taylor expansion for f .t; x; x 0 / with respect to x. The second way of conversion a given problem to nonresonant one is based on an appropriate choice of "good" approximation to expected solution. We provide the existence results illustrating both ways.