Abstract: In order to reduce the use of fossil fuels and explore new renewable energy, bio-aviation kerosene was prepared by one-step hydrogenation of castor oil in the high-pressure micro fixed bed with Pt-La/SAPO-11 as catalyst. The effect of different reaction temperature, space velocity, hydrogen pressure and hydrogen oil ratio(hydrogen volume/castor oil volume, the same below) on the selectivity of C₈-C₁₆ hydrocarbon, C₈-C₁₆ iso-alkanes, C₈-C₁₆ aromatics and conversion ratio of triglyceride were explored. The optimal technological parameters were obtained as follows: temperature 400℃, hydrogen pressure 4 MPa, space velocity 1 h^-1, hydrogen-oil ratio 1 000. Under these conditions, the conversion rates of the product was 87.78%, the selectivity of C₈-C₁₆ hydrocarbon was 58.24%, the selectivity of C₈-C₁₆ iso-alkanes was 17.32%, and the selectivity of C₈-C₁₆ aromatics was 10.72%. According to the previous research, it was speculated that the unsaturated fatty ricinoleic acid was converted into saturated ricinoleic acid by hydrogenation on the Pt-La/SAPO-11 catalyst, and then intermediate products such as alcohols and acids were generated at the acidic sites of the catalyst. The hydrocarbon product obtained through dehydroxylation, decarboxylation and other reactions on metal sites and acid sites, and finally obtained aviation fuel component C₈-C₁₆ alkanes under hydrogenation, cracking and isomerization reactions.