The influences of intake flow on spray and wall-film were studied by using numerical simulation and test-bed experiment. Some results were received and they showed that the intake flow was useful for liquid fuel evaporation before impinged on the wall and could increases the spay penetration and deflect the spray in the direction of the intake flow. Meanwhile, the momentum of the spray droplets was strengthened and more small droplets could be received by the intake air flow which can enlarge the wall-film area and improve the evaporation of wall-film. If the engine body temperature was low, the effect of intake flow on engine performance was obvious while it had no difference under wide throttle open angle for high engine temperature.