Abstract: In order to satisfy the quality demand of jet fuel fraction from hydrocracking unit by adjusting reaction conditions，the effect of reaction parameters of hydrocracking temperature，hydrogen pressure，volume velocity and volume ratio of hydrogen to oil on jet fuel yield and properties were tested using intermediate-base gas oil as feedstocks in single stage once through mode in a hydrocracking device packed with two catalysts in series. The result showed that the jet fuel fraction yield was affected by conversion rate of gas oil under different reaction conditions, the higher the conversion rate of wax oil above 350℃, the higher the jet fuel yield, and that at the same conversion ratio under different hydrogen pressure, the jet fuel fraction smoke point was effected by aromatic saturation extent，while the effects of other reaction conditions on the smoke point were all related to the conversion depth of gas oil feedstock.

Key words: hydrocracking, gas oil, jet fuel, smoke point