Because of inherent characters of rubber materials, there exists some differences on antiswelling property of rubber materials in gasoline with different methanol volume fraction. Immersion tests in gasoline 93# or gasoline with different methanol proportions are conducted to show the antiswelling property of 3 rubber materials commonly used in motor vehicles. The results show that silicone rubber has better antiswelling property in gasoline with high methanol proportion; on the contrary, fluorine rubber has good resistance to swelling in low proportionmethanol gasoline; Nitrile Rubber has good antiswelling property in all gasoline with different proportion of methanol. 