Abstract: The effects of blending FCC LCO or CGO in the feed of a 2.0 Mt/a hydrocracking unit on process parameters, equipment conditions, product properties and energy consumptions were studied. The results showed that compared with LCO, when CGO was used as a blending material, the average temperatures of refining reactor and hydrocracking reactor both increased, while the total temperature rise of the refining reactor reduced; the salt deposition rate of high pressure heat exchanger accelerated. At the same jet fuel yield，total hydrogen consumption was reduced，the qualities of jet fuel and diesel and unconverted oil improved, meanwhile the potential aromatic content of heavy naphtha decreased and the total energy consumption increased. Under those two conditions，good quality naphtha，jet fuel，diesel and unconverted oil can obtained by adjusting process parameters.

Key words: hydrocracking, LCO, CGO, jet fuel, energy consumption