Hydrotreatinghydrodewaxing double reactor in series process was used, lubricating base oils were produced with a refinery gas oil as raw material. The results show that the main products are lubricant fraction of high viscosity, and freezing point drops to below -10 ℃, little amount of byproduct light diesel oil, crude gasoline and liquid gas. This process demands simple process, good refining pour point depressant, high lubricating oil yield.