Abstract: The fluid model was used to simulate the dielectric barrier discharge with N₂ as the working gas under very high pressure. And an experiment was performed utilizing optical emission spectroscopy for comparison and verification. In this model,10 reactants and 28 reactions are considered. The pressure ranges from 1 atm to 5 atm,and the molecules N₂(C)are considered as representative of reactive species. In the bulk of plasma,the simulation results indicate the relationship between the average electron density and the pressure is complicated and is affected by the density of neutral species and electron temperature. The results show that the densities of reactive species decrease exponentially with the increase of pressure. The electron temperature decreases with the rise of pressure. The simulation results can describe the detailed temporal and spatial distribution of plasma parameters.The tendencies of average electron temperature,the electron density,and excitation of nitrogen N₂(C)of the bulk of plasma calculated from the spectrum agree with simulation results.