Abstract: The new "three traditional technologies" units for production of bright stock were built through expansion and reconstruction of old processing units (furfural refining, ketone-benzene dewaxing and clay refining) of SINOPEC Jinan Company. The problems of operation instability, high energy and material consumptions were occurred due to changes of feedstock properties during the start-up. These problems were solved well by technical transformation and adjustment of air cooler process for furfural unit and self-pressure process for three-effect evaporation tower, optimization and adjustment of heat exchange scheme and fresh solvent ratio for ketone-benzene dewaxing unit, stopping clay addition and realizing heat integration of ketone benzene dewaxing unit and clay refining unit. The direct economic benefit of these measures is more than ￥8.042 7 millions/a.