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The polycrystalline phase WO3/g-C3N4 was synthesized under stirring using tungstenic acid (H2WO4) and graphit-ic carbon nitride (g-C3N4) as raw materials. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), the Fourier transform infrared spectroscopy (FT-IR), and the Brunauer-Emmett-Teller analysis (BET). The polycrystalline phase WO3/g-C3N4 was determined by XRD technique. The oxidative desulfurization process was investigated using WO3/g-C3N4 as the catalyst, 30％ hydrogen peroxide (H2O2) as the oxidant, and 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) ionic liquids (ILs) as the extractant. The operating conditions, including H2WO4 amount, IL dose, H2O2 volume, temperature, catalyst dosage, and types of sulfur compounds, were systematically researched. The desulfurization rate could reach 98.46％ for removing dibenzothiophene (DBT) from the model oil under optimal reaction conditions. In addition, the catalytic activity was slightly decreased after five recycles of catalysts. The reaction kinetics analysis shows that the oxidative desulfurization system was in accord with the first-order reaction kinetics equation. The mechanism of oxidative desulfurization was proposed.