A computational fluid-dynamics simulation for a turbulent combustion is established using a stochastic approach, and applied to Diesel Combustion. The nonuniform states of turbulence mixing, ignition process and formation of Nitric oxide (NO) are statistically described using the probability density function (PDF). The results show that the courses of in-cylinder pressure is good agreement with experimental data and the rapid formation of NO in the beginning of the combustion is calculated. Furthermore, the local hot spots, which related to NO production, are well predicted.