ZnO nanostructure were prepared by decomposing zinc hydroxide Zn(OH)2using hexanaldehydeat PH 9 and 105 °C for 10 h. Size of ZnOnano can be like flower or rod controlled by pH of the aqueous solution. Nanostructure of ZnO has been studied bys (SEM), (XRD) and (FTIR). Synthesized Zinc oxide nanostructures possess a hexagonal quartzite temple. ZnO powders were measured by Also using Zeta potential and Particle Size Analyzers and size distribution of the ZnO powder using particle size analyzer (NanoBrook 90Plus Particle Size Analyzer) .