Vacuum deep distillation of crude oil is one of representative technology for increasing the yield of light oil. The influence of process parameters in stripping section of vacuum tower on pull-out rate was tested, and the impact of tray or structural packing used in the stripping section of tower on strippin efficiency was disscussed. Furthermore, the coking of structural packing in the stripping section was analyzed. Finally, structural packing in the stripping section showed great impact on enhancing vacuum pull-out tate and would not lead to the coking in the stripping section.