The energy crisis of these days has made researchers to use energy sources optimally and had them to reduce energy consumption. There are many attempts to replace polymers instead of metals and metal alloys to reduce energy consumption by the good process ability of polymers and reducing the weight of the products produced by them. In this regard, due to defects and weaknesses of polymers in comparison with metals and alloys, attempts are made to compensate for the limitations of polymers by adding other materials, including attempts to increase the wear resistance of polymers by adding nanoparticles to polymers and the production of polymer Nano composites. In this study, ZnO nanoparticles were added in 1, 3, 5 and 10 weight percentages to high density polyethylene, Polyethylene-zinc oxide nanocomposite has been produced and its mechanical properties and wear resistance were compared to pure polyethylene and evaluated. To evaluate the mechanical properties the simple tension and bending tests were conducted. Also pin on disk tests on the produced Nano composites were conducted to study the tribological behavior of the samples. It was found that adding ZnO nanoparticles to polyethylene increases the flexural strength from 29 MPa to 47.5 MPa, and increases the bending strength from 31 MPa to 31.6 MPa. Also, adding zinc oxide nanoparticles increases the wear resistance of the Polyethylene, which this mechanical properties and wear resistance improvement were increased by increasing the amount of nanoparticles. Keywords: Nanocomposite, Polyethylene, Zinc oxide, Mechanical properties, Wear resistance