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Direct Injection Gasoline different numerical simulation models were analyzed. There are three kinds of the numerical simulation of turbulent: direct numerical simulation, large eddy simulation and Reynolds averaged simulation. Direct numerical simulation of turbulence modeling without using the numerical calculation solves the flow equations directly. Large eddy simulation of the main idea is: use of large-scale direct numerical solution of turbulent flow, only small-scale turbulence modeling. This method is much smaller than the spatial resolution requirements of direct numerical simulation method; under the conditions of the existing computer can simulate a high Reynolds number and more complex turbulence; other hand, it can get Renaults average More information about simulated turbulence. Reynolds-averaged models do not need to calculate the various scales of turbulence, it only calculates the average motion, and so it requires low spatial resolution, calculation of small amount of work Calculation of the cylinder was optimized to determine the cylinder calculation method of calculating the required application.