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刀切法是在不断完善中的一种非参数统计方法，它实质是一种双重回归抽样法。通过对收集１１４株落叶松材料进行分析，介绍了用刀切法估算材积的具体步骤，在小样本条件下，估计精度达８０％以上，实际精度达９０％以上。
Knife-cut method is a non-parametric statistical method in continuous improvement, which is essentially a double regression sampling method. Based on the analysis of 114 collected larch materials, the specific steps of estimating the volume by knife cutting are introduced. Under the condition of small sample, the accuracy of estimation is more than 80% and the actual precision is over 90%.