Typical sample plots were set up in the distribution range of cryptomeria fortunei in Guizhou province,and 331 samples wood data were investigated according to 8 diameter steps,among which 240 were constructed and 91 were tested.Select "technical regulations for compiling binary stand timber volume table" and four number-table models related to stand volume,to simulate the model and taking the weighted least square method of ForStat statistical software,the different models of relative error from the sum of squared residuals,relevant index,total 9 indexes such as the fitting effect of comparative analysis and evaluation,elected binary standing timber volume optimal model of cryptomeria fortunei,mainly reflected in the segmented inspection the size order total relative error are less than ±3%.