DMC改善NOx排放。 MTBE will pollute the groundwater, and it is urgent to find its alternatives. Dimethyl carbonate (DMC) and diisopropyl ether (DIPE) were selected as gasoline antiknocks, which added to 93 gasoline by 3% and 6% volume fraction respectively, and then their antiknock characteristics were studied by experiment. The effects of different volume fraction DMC and DIPE on gasoline engine fuel economy, combustion and emissions characteristics were obtained by measuring cylinder pressure, fuel consumption and emissions data through engine test-bed.The results show that DMC and DIPE lead to fuel consumption increasing 0.85% and 1.6% respectively at 3% volume fraction, and 3.7% and 1.3% respectively at 6% volume fraction. The peak value of cylinder pressure drop is decreased and the largest release heat point is postponed, especially at low loads. The HC emissions are lowered significantly and DMC reduces the Nox emissions.  