Abstract: The paper discussed the amount effect on yield percentage and energy consumption of ketone-benzol dewaxing and deoiling unit. To optimize the operation, when the lubricant oil frozen at -5℃ is processed, the parameters should be set as follows: processing amount at 10 t/h, diluting amount at 12 t/h, feeding temperature controlled between -13℃~-12℃, yield percentage is 65.93% with an energy consumption of 5887 kWh in average; when the 3rd decompression line wax is processed, the parameters should be set as follows: processing amount at 5 t/h, diluting amount at 15 t/h, feeding temperature controlled between 3℃~4℃, the yield percentage obtained is 74.53% with an energy consumption of 4924 kWh in average.