In this paper, we study the following nonlinear problem of Kirchhoff type: {-(a + b integral(R3) |del u|(2)) Delta u + lambda V(x)u = |u|(p-2)u, in R-3, u is an element of H-1(R-3), where the parameter lambda > 0 and 4 <= p < 6, constants a, b > 0. By variational methods, the results of the existence of nontrivial solutions and the concentration phenomena of the solutions as lambda -> +infinity are obtained. It is worth pointing out that, for the case p is an element of (4, 6), the potential V is permitted to be sign-changing.