Abstract: FCC gasoline, as a main blending component of automobile gasoline in China with a blending ratio of 70%,is the bottleneck that prevents further improving the quality of automobile gasoline. FCC light gasoline etherifying technology changes tertiary carbon alkene into ether,and makes up for the shortage of MTBE output.It not only raises octane rating and oxygen content but also lowers alkene content of gasoline and vapor pressure,thus is worth developing and popularizing.