In this article we study the p-biharmonic equation Delta(2)(p)u + V (x) vertical bar u vertical bar(p-2) u = f (x,u); x is an element of R-N, where Delta(2)(p)u = Delta (vertical bar Delta(u)vertical bar(p-2) Delta u) is the p-biharmonic operator. When V (x) and f (x,u) satisfy some conditions, we prove that the above equations have Nehari-type ground state solutions.