Abstract: In view of the fact that the demand for diesel fuel in the domestic oil product market is decreasing while the demand for jet fuel，heavy naphtha and hydrocracker tail oil is increasing，SINOPEC refining and chemical enterprises have flexibly adjusted the product scheme through adopting new hydrocracking catalyst to replace partly original catalysts, grading hydrocracking catalysts with different performance, optimizing product cutting solution and producing white oil from diesel fraction. The yields of jet fuel，heavy naphtha and hydrocracker tail oil were improved and the yield of diesel was reduced. The qualities of jet fuel and tail oil products were also improved. After implementation，the yield of jet fuel of hydrocracking unit increased by 3.58-13.28 percentage points，and the yield of diesel decreased by 5.14-5.81 percentage points; the ice point of jet fuel was declined by more than 1 ℃，and the BMCI of tail oil declined by 1.2-1.7.

Key words: hydrocracking unit, product structure, catalyst grading, distillation range cutting scheme