MTBE (methyl tert-butyl ether), is an additive with high octane number (RON118, MON101), low vapor pressure and similar calorific value with the hydrocarbon, it can be with methanol gasoline miscible in any proportion and can increase the tolerance on water and layered ability of methanol gasoline. According to vehicle M15 methanol gasoline local standard, the influence of methanol and MTBE dosages on vehicle gasoline properties was studied to blend new M15 vehicle methanol gasoline which can reach the requirements of automobile engine usability. The results show that when the addition of MTBE is 50%, water tolerance of M15 is about 3.0%, and 1.5% water content of M15 is not layered in condition of -38 ℃.