Abstract: SAPO-11 molecular sieves were treated with different acids and salts and the modified Pt/SAPO-11 catalysts were prepared by loading platinum on the pre-treated SAPO-11. The catalyst samples were characterized with XRF, XRD, N₂ adsorption-desorption, SEM, NH₃-TPD and pyridine Py-IR to analyze their physicochemical properties. The results showed that the modification of acid and salt did not destroy the structure of SAPO-11, but improved the pore volume, pore size and specific surface area of the catalysts, meanwhile, the acidity and acid amount of the zeolite were also changed obviously. In a fixed-bed reactor, one-step hydrgenation of Jatropha curcas oil to iso-alkanes over modified Pt/SAPO-11 catalyst was carried out. Combined with catalyst characterization results, it was concluded that those parameters, such as particle size, specific surface area, pore diameter, acidity and acid amount, would affect the activity and product distribution of the catalysts. Among these modified catalysts, it is found that the Pt/SAPO-11 catalyst treated with 0.5 mol/L citric acid solution exhibited an excellent catalytic performance in one-step hydrogenation of Jatropha curcas oil, owing to its appropriate pore size, acidity, B acid and L acid distribution. The yield of bio-jet fuel components (C_8-16) was 32.47% and the selectivity of isoparaffins was 53.13%.