依据层流小火焰理论,在选定截尾式高斯分布作为概率密度分布函数的基础上,对函数中的两个重要参数σ和μ进行数值计算,对所得σ和μ的数值利用最小二乘法进行数据拟合,最终得到两个参数的拟合公式,即得到了概率密度分布函数的拟合公式.与数值计算所得结果相比较,拟合公式符合实际情况,具有一定的准确性. According to the laminar flame theory, on the basis of selecting the truncated Gaussian distribution as the probability density distribution function, two important parameters σ and μ in the function are numerically calculated. The values ​​of σ and μ are calculated by the least square method Finally, we get the fitting formula of two parameters, that is, the fitting formula of probability density distribution function is obtained.Compared with the numerical results, the fitting formula is in accordance with the actual situation and has a certain accuracy.