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ZnO micro/nanostructures with various morphologies were grown via hydrothermal etching of Zn foil. Controlling the reaction temperature and time, rod-like, pencil-like, tube-like and flowerlike ZnO micro/nanostructures could be prepared directly on the Zn foil surface at temperatures 100-180 °C with excellent reproducibility. X-ray diffraction patterns indicated that these ZnO micro/nanostructures were hexagonal. Possible mechanisms for the variation of morphology are discussed. Moreover, photoluminescence spectra of the as-grown samples revealed that all of them consist of UV emission band at around 392 nm. crystal morphology, hydrothermal, photoluminescence