CH-20 hydrotreating catalyst, using Mo-Ni as hydrogenating component and Al203 Prepared fromAl2(SO4)3 and NaAlO2 as support,has a suitable pore structure,high hydrogenating activity and good stabili-ty. It can be used in coker gas oil (CGO) hydrotreating process to prepare FCC ftedstocks. The test resultsshow that using CH-20 catalyst under moderate pressure (H, partial pressure 6. 4MPa) and hydrotreatingpipeline CGO with N content of 0. 49% (basic-nitrogen 0. l9% ) and S content of 0. 92%, hydrodenitro-genation (HDN) efficiency of 76. 0% ~78. 0%,de-basic-nitrogen effieiency of about 85% and desulfurizationefficiency of up to 95% or even higher can be attained. CH-20 was first commercially used on a 300kt/d hy-drotreating unit at Changling Refinery in February, 1997 with good hydrotreating results. Under inlet pres-sure of 6. 3MPa (H2 partial pressure 5. 8MPa) and inlet temperature of 340 ℃ and with CGO of 0.45% N con-tent (basic-nitrogen 0.165% ) as feedstock, tbe basic-nitrogen content in hydrotreated coker gas oil (HT-CG0) is less than 5O0μg/g。