In this paper, we discuss the existence of solutions for the 2n-order boundary value problem (-l)(n)u((2n))(t) = f(t, u(t), u"(t),...,u((2n-2))(t)), 0 < t < 1, u((2i))(0) = u((2i))(1) = 0, i = 0, 1,..., n-1, where f : [0,1] x R-n --> R is continuous. (C) 2002 Elsevier Science Inc. All rights reserved.