According to global standards, the sulfur content of the hydrocarbon fuels which are used in the traortation industries is considered as one of the most important contaminants in the world and it should be decreased to 10 ppmw. However, most of the refineries in the world produce fuels with sulfur content of more tha ppmw. One of the newest and economical methods to reduce the sulfur content around the world is catalytic oxidation. In this study, WO3 @ g-C3N4 nanocatalyst synthesized by wet impregnation method with a content of 1.64 wt% tungsten on a carbon nitride graphite nitride as a support. The analytical and structural characteristics were identified by systematic characterization techniques such as XRD, FESEM, EDS and BET. in the oxidative desulfurization process in this study. The efficiency of reaction with optimized parameters was 87 %. The catalytic desulfurization was performed in a model fuel, including the refractory Sulfur compound “dibenzothiophene” in Hexane solvent (1500ppmw of sulfur). The effect of the operational parameters on the reaction, such as the catalyst mass, amount of oxidant, temperature and time of the reaction yeild have been investigated in the mild condition without presence of hydrogen gas. Initial and final concentrations of dibenzotheiphene was evaluated by GC-FID.