Electronic characteristics density of state, density of bonds, and the thermodynamic characteristics (Gibbs Energy, Enthalpy, Entropy, and Heat Capacity) of coronene hydrogen bare C₂₄ and reduced coronene oxide C₂₄O₅ were investigated with the variation of temperature between (298 – 398) K. The hybrid functional B3LYP (Becke, 3-parameters, Lee-Yang-Parr) with 6-311G** basis sets was employed in Density Functional Theory (DFT). It was found that the value of the energy gap of coronene hydrogen bare C₂₄ was 3.5 eV, while it decreased for reduced coronene oxide C₂₄O₅ to 1.38 eV due to adding levels inside the energy gap. The theoretical values of bond length were 1.38 Å for the C=C bond and 1.22 Å for the C=O bond, which were in good agreement with experimental results. An exergonic reaction was indicated by a decrease in the Gibbs energy (in a negative sign) as the temperature rise. Entropy, heat capacity, and enthalpy all increased in value with temperature.