Abstract: Huizhou petrochemical company of CNOOC energy development Ltd introduced the hydroisomerization dewaxing technology developed by Chevron Company and invested in the construction of a 400 kt/a hydroisomerization dewaxing unit. The hydrocracking tail oil is used as a raw material. Under the same reaction pressure and hydrogen/oil ratio conditions, the effect of the feed rate and its wax content, and pour point of main product (150N base oil) on the reaction temperature were tested. The results show that in order to achieve the same properties of 150N base oil using the same kind of raw material, the reaction temperature is increased by about 0.5 ℃ for every increase of feed rate 1t/h; and that in the case of stable feeding quantity, reaction temperature needs to increase by about 1.2 ℃ for every 1℃ reduction of pour point of 150 base oil. When the feed rate and the property of base oil 150N remain unchanged, the reaction temperature increases with increasing wax mass faction of the feed.