Waste plastics were converted into valuable liquid hydrocarbon fuel. it is can be used as different purpose of energy-source such as petrol engines, diesel engines, generators, vehicles and its good source of chemicals etc. Plastics have many properties like light weight, high durability so its demand increases in every sector. Pyrolysis of the waste plastic (hdpe) was carried out with CuCO3 catalysts and temperature range from 0 °C to 390 °C. The collected liquid hydrocarbons fuel was characterized by FT-IR, NMR, GCxGCMS spectrometer and fuel density was 78 g ml-1 and conversion was very good. The research paper exhibits concentrating on application for solving daily life issues and problems of plastic. Keywords: Pyrolysis, Liquid hydrocarbons fuel, CuCO3 catalysts, Conversion, Glass reactor, GCxGCMS