Abstract: In this paper,a simple method for fabricating ZnO nano-disks is given,and ZnO nano-disks with size about several microns and thickness about 400nm are obtained on Si substrates（100） in the atmosphere,with Zn power thermally evaporated directly in the crucible.X-ray diffraction（XRD） reveals the grown samples are hexagonal ZnO crystal.Scanning electron microscopy（SEM） images show that the morphology and size of samples is closely related to the evaporation temperature of zinc.The photoluminescence（PL） spectrum at room temperature of ZnO disks has a strong green peak centered at 510 nm,which is due to the presence of oxygen vacancies in the samples.The energy-dispersive X-ray analysis（EDS） indicates samples are zinc oxide without any impurities,with Zn content higher than O ones,and have more O vacancies.The EDX results are consistent with PL experiments.