High-ordered ZnO nano-rod arrays with an average length of about 575 nm and diameter of about 50-100 an are vertically grown on indium-tin oxide (ITO) glass substrates using electrochemical deposition (ECD) method processing in a two-electrode cell at 85℃. The current intensity in the growth process plays an important role. So the effect of growth current intensity was studied with respect to the morphological, structural, and photoluminescence properties of the ZnO nanopillars. The isolated nanopillars fabricated at 0.15 mA current intensity had the best structural and optical qualities. The clear lattice fringes in the image of high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) showed that a single-crystal structure of ZnO nanorods with the growth direction along the [002] direction. The top-sectional field emission scanning electron microscopy (SEM) images results revealed that the current intensity played a key role in elongating the length of the ZnO nanorods. A sharp peak in the UV region and a weak broad peak in the visible region between 400 and 500 nm were shown in the room temperature photoluminescence (PL) spectra of nanorod arrays, suggesting the ZnO nanoroci arrays with high-quality crystals were obtained.