Abstract: The first commercial application of PHF-101 diesel hydrotreating catalyst in a diesel hydrotreating unit with 1.20Mt/a capacity of Daqing PetroChemical Company，PetroChina is introduced. The feed is a mixture of Daqing FCC diesel, coker diesel and coker gasoline. Under different operation conditions, the diesel products can meet the standard of national phases of III, IV and V. The results of 37 month commercial operation prove that the catalyst has a high activity and good stability.