Abstract: An unsupported diesel hydroupgrading catalyst was prepared by co-geling and characterized by N2 adsorption-desorption isotherms, XRD, NH3-TPD, Py-IR and SEM. The catalyst was evaluated by two different FCC diesels for the hydrodesulfurization, hydrodenitrogeneration and hydrodearomatization and tested the feed adaptability for high S and aromatics inferior feedstocks. The results show that at a temperature of 360 ℃, for the Qingdao FCC diesel consisting of difficult to be removed DBTs as the main S-containing compounds, the sulfur content can be reduced to 15 μg/g from 7 428 μg/g; for the Shenghua FCC diesel consisting of easily removed BTs as the main S-containing compounds, the sulfur content can be reduced to 14 μg/g from 5 114 μg/g. The catalyst can remove the N-containing compounds completely in the two FCC diesels. Besides, polycyclic aromatic hydrocarbons in the two FCC diesels can be removed by up to 99%.