The ZnO nanotubes were prepared by hydrothennal method in the presence of hydrogen peroxide (H2O2). X-ray diffraction (XRD), transmission electron microscope (TEM) and BET analysis were used to characterize the structure, morphology of as-prepared ZnO nanotubes. It was found that 100 percent transfonnation was obtained after 90 h and the length of the nanotubes can increase from a several hundred nanometers up to several micrometers by stirring the reaction mixture before aging. In addition, roles of H2O2, aging and stirring process for the fonnation of nanotubes were discussed in detail.