Evaluation of hydrocracking catalyst CHC- l showed superior qualities of catalyst CHC- 1.When it was used for hydrocracking reaction, the yield of middle distillates (jet fuel and diesel fuel)can reach more than 71 m%. When it was used for medium-pressure hydro-upgrading of Daqing FCC diesel fuel, diesel density was decreased by 0.0284-0.0365 g/cm3 (20℃). Cetane number increased by 7.8-10.5 and the contents of sulphur and nitrogen were remarkably reduced. The storage stability of the upgraded diesel was improved.