ZnO nanorod arrays were prepared using a chemical solution route on fluorine-doped SnO2 conductive glass pre-coated by a thin ZnO seed layer. Morphology, crystal structure and growth direction of the nanorod arrays were characterized by SEM and XRD respectively. The SEM results demonstrated that ordered arrays of ZnO nanorods grew vertically on the substrate. XRD measurement revealed the ZnO nanorods were grown along the  direction of the ZnO crystallites. Under optimal condition, ZnO nanorods with the average length about 6-7 μm and the diameters about 10nm at the tip and 150 nm at the base were obtained. The optical properties of ZnO nanorod arrays were characterized by transmittance spectra and photoluminescence measurement at room temperature.