The Object of the Present Work Is to the Preparation of Zno Nanofluid. This Work Summaries Characterization of Zno Nanofluid. Nanofluid Is a Stable Colloidal Suspension of Low Volume Fraction of Ultrafine Solid Particles In Nanometric Dimension Dispersed In Conventional Heat Transfer Fluid to Offer a Dramatic Enhancement In Conductivity. a Approach of Synthesis Of( Zno) Nanoparticles By Chemical Precipitation Method Nanofluids Has Been Adopted Here. Nano Particles Were Characterized By X-Ray Diffraction (Xrd), Scanning Electron Microscopy (Sem), Dynamic Light Scattering Particle Size Analyzer, Uv-Visible Characterization.