应用非参数核密度估计理论和方法 ,对从吉林省汪清林业局抽取的 12块天然林样地进行直径结构模拟 ,结果表明 :( 1)当 Webull及其它分布函数能很好模拟的样地时 ,核估计方法也能对该样地进行模拟 ,并且要优于分布函数法 ;( 2 )在分布函数不能描述林分时 ,核估计方法仍能描述该林分 ,并能取得很好的效果 ;( 3)不论是天然林还是人工林均可用核估计方法对林分直径结构进行模拟 ,非参数方法可能成为一种有用的方法 Using the theory and method of non-parametric kernel density estimation, 12 natural forest plots extracted from Wangqing Forestry Bureau of Jilin Province were simulated. The results show that (1) when Webull and other plots with well-distributed distribution function , The kernel estimation method can also simulate the sample and is superior to the distribution function method; (2) When the distribution function can not describe the stand, the kernel estimation method can still describe the stand and can achieve good results ; (3) Non-parametric methods may be useful methods for kernel diameter modeling both in natural forests and in plantations using kernel estimation methods