Abstract: The paper puts forward the process of gasoline unloading assisted by low pressure, and by way of experimental data, discusses extent of influence of air dissolvility, dissolving velosity and releasing amount of pressure decrease, etc on oil and gas loss, gas blockage, cavitation and quality of oil product。The author concludes that this process is a good mcthod for getting rid of gas blockage and cavitation and is economic and easy to do as well.