Abstract: Using SiO₂ and melamine as raw materials, mesoporous graphitic carbon nitride(mpg-C₃N₄) was prepared by high-temperature baking method. Pd/mpg-C₃N₄ was then prepared by impregnating of Pd nanoparticles and used to catalyze the hydrogenation of rosin. XRD, FT-IR, TEM, ICP-AES, XPS, nitrogen adsorption-desorption and GC were used to analyze the structure, morphology, actual loading of Pd, metal valence, specific surface area, pore size and catalytic activity of the catalyst. The results showed that nano-Pd was successfully uniformly dispersed in the layered structure of carbon nitride. Pd/mpg-C₃N₄ still maintained the mesoporous structure after Pd loading. However, due to Pd loading, the BET surface area, pore volume and pore diameter of mpg-C₃N₄ were reduced to 47.73 m²/g, 0.17 cm³/g and 3.39 nm, respectively. Hydrogenated rosin products with 5.99% dehydroabietic acid and less than 1% abietic acid were obtained under the optimized conditions for the hydrogenation of rosin (7.96% Pd loading, 5 MPa H₂, 150 ℃, 4 h). After four cycles for the catalyst, the GC content of tetrahydroabietic acid decreased from 37.12% to 24.71%, and the GC content of dehydroabietic acid increased from 5.99% to 9.76%.