Abstract: To well understand the new generation hydrocracking catalyst FC-20 with high selectivity of middle distillates, the tests in pilot plant were conducted using several kinds of feedstocks under different pressures, different conversion depths with different diesel upgrading scheme. The test results show that the catalyst FC-20 is characterized by suitable cracking activity, high hydroisomerization activity, good temperature sensitivity and strong ability to preferentially crack and isomerize wax components in feed. The catalyst also has a good flexibility to product scheme and wide adaptability to feeds, which could be used to produce premium chemical naphtha, No.3 jet fuel, clean diesel with low solidification and high cetane number, and low pour point lube base oil feed. The results of commercial application indicate that catalyst FC-20 can upgrade the poor quality diesel and improve the low temperature fluid performance.