GDI （Gasoline Direct Injection into cylinder）has become an up to date research topic.With a precise control of jet timing by computer against the operating conditions

this injection adopts a quality changing regulation of gasoline engine power instead of amount changing regulation of intake flow.Leading to a high specific power rate

low fuel consumption and very low discharge level of harmful atmosphere.Take 4G93 gasoline engine of Mitsubishi as an example

this paper discussed the technological characteristics and features of GDI.