Abstract: A class of nonlinear nonlocal for singularly perturbed Robin initial boundary value problems for reaction diffusion equations with boundary perturbation is considered. Under suitable conditions, first, the outer solution of the original problem was obtained.Secondly, using the stretched variable, the composing expansion method and the expanding theory of power series the initial layer was constructed.Finally, using the theory of differential inequalities the asymptotic behavior of solution for the initial boundary value problems was studied,and educing some relational inequalities the existence and uniqueness of solution for the original problem and the uniformly valid asymptotic estimation were discussed.

Key words: nonlinear, reaction diffusion, singular perturbation