Abstract: In the light of different forms and characteristics of evaporation loss of oil vapor during loading, transportation and unloading of road tanker, research situations and problems in control technology of oil vapor evaporation are analyzed. It is pointed out that oil vapor evaporation during storage and transportation of gasoline with road tanker should be effectively controlled from optimizing loading and unloading techniques for road tankers, developing oil vapor recovery unit and searching methods for bringing down oil vapor evaporation.