In order to meet the requirements of CNOOC Zhongjie Petrochemical Co.，Ltd.8×10⁵ t/a diesel hydrofining unit urgently needs of high-altitude and ultra-deep desulfurization catalysts，the cobalt molybdenum THDS-2 and nickel molybdenum THDS-3 catalysts were developed in collaboration with CenerTech Tianjin Chemical Research and Design Institute Co.，Ltd.This series of catalysts adopted the carrier prepared by the silica modified alumina combined with the gel process.Compared with conventional methods，the specific surface area of the carrier was increased by 14.5%，the pore volume was increased by 8.2%，and the strong acid content was decreased to 0.196 mmol/g.The activity of the catalyst impregnated with double complexing agent was higher than that of the catalyst prepared with single complexing agent.In the evaluation process of micro fixed bed reactor，the grated loading method of the THDS-2 and THDS-3 catalysts was adopted without increasing the reactor loading volume，the reaction process had advantages such as excellent hydrogenation activity，good activity stability，and wide adaptability to raw materials.During the industrial calibration，the catalyst volume space velocity was 1.79 h^-1， the treatment capacity reached 127.3 t/h，and the sulfur and nitrogen mass fractions of the product diesel were less than 5 μg/g，meeting the needs of enterprise capacity expansion， and realizing the maximum release of plant capacity.