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The improvement of environmental performance by gasoline direct injection (GDI) engine is remarkable. But the gas mixture formation process, which greatly affects the combustion of direct injection spark ignition (DISI) engines, still has a lot of areas left unclear. In this paper, a CFD model of air intake, fuel spray atomization and mixture formation process of a certain GDI engine was developed and experimentally verified for DISI injection study. The effects of injector spray layout and injection strategy on mixture quality of DISI engine were analyzed by respective simulation of three different injectors T1470, T1471, T1472. Results show that the mixture quality can be improved with appropriate injector spray orifices layout.