Abstract: To further improve product structure, extend the range of high value-added products, and further reduce diesel output, the feasibility of producing No.5 industrial white oil in a 1.8 Mt / a hydrocracking unit was tested. The results of two technical trial productions showed that the industrial white oil can be produced from diesel feedstock through hydrocracking by adjusting process parameters and revamping the fractionation system of the hydrocracking unit. The pour points of the products were -15 ℃ and -16 ℃, the viscosities（40 ℃）were 4.299 mm2 / s and 4.415 mm2 / s, and the aromatic mass fractions were 2.95% and 2.59%, respectively, meeting the No.5 industrial white oil（Ⅰ）standard of NB / SH /T 0006-2017.

Key words: hydrocracking, No.5 industrial white oil, operation adjustment