In this article, we study the existence and multiplicity of solutions of the quasilinear Schrodinger equation -u '' + V(x)u - ( broken vertical bar u broken vertical bar(2))'' u = f (u) on R, where the potential V allows sign changing and the nonlinearity satisfies conditions weaker than the classical Ambrosetti-Rabinowitz condition. By a local linking theorem and the fountain theorem, we obtain the existence and multiplicity of solutions for the equation.