Herein we report a simple method to grow ZnO nanorod/Graphene oxide (GO) array without the initial seed layer on a printed circuit board (PCB) as the substrate based on Galvanic effect. The hydrothermal growing conditions such as temperature and time were investigated by X-ray diffractometry (XRD), Raman scattering, as well as Scanning Electron Microscopy (SEM). It shown that as-prepare ZnO nanorod was grown well-vertically on the substrate. Furthermore, we investigated the photocatalytic activity of synthesized samples which showed the enhanced photodegradation ability in the composite sample.