Abstract: The No.1 gasoline and diesel hybrid hydrotreating unit in Tahe Refining and Chemical Co. Ltd. was revamped according to MHUG technology developed by RIPP. The process configuration is composed of hydrogenation and then hydro-upgrading sectors. A new hydrofining reactor was added as the first reactor loaded with RN-410 refining catalyst. The original reactor is transformed into a hydrotreating reactor as a second reactor loaded with RIC-3 upgrading catalyst and post-refining catalyst RN-410. The China V diesel is successfully produced, the cetane number increases from 40 of feed to about 51.2 of the product，the sulfur content of less than 5 μg/g，and the PAHs is only 1.8%. The device is stable under full load conditions.

Key words: hydrogenation, MHUG, upgrading, cracking, cetane number