Abstract: Using different zinc salts as raw materials, NaOH and NH3·H2O as precipitants as well as triethanolamine (TEA) and sodium dodecyl sulfate (SDS) as dispersants, nanometer or micron scale ZnO with different morphologies was prepared by using mild condition method including boiling reflux, microwave heating and aging at constant temperature. The products were characterized by means of XRD, TEM and SEM. The results indicate that the products were single phase ZnO with hexagonal wurtzite structure. Spindly ZnO was prepared with NH3·H2O as precipitant. Sheet ZnO was prepared with ZnSO4 as raw material and NaOH as precipitant. Needle-like and rod-like ZnO was prepared with Zn(NO3)2, Zn(CH3COO)2 and ZnCl2 as raw materials. Rod-like ZnO with length of 0.5 μm and width of 0.1 μm was prepared after microwave heating and needle-like ZnO was prepared after aging at constant temperature of 100 ℃.