Abstract: In order to meet the needs of forest production and management, dealing with cases of illegal felling and excessive felling, checking and accepting the felled forest volume, the relationship between the ground diameter and volume of Cryptomeria fortunei was studied and the volume table of Cryptomeria fortunei ground diameter was compiled. According to the resource distribution of Cryptomeria fortunei in Guizhou province, the author uses the typical sampling method, 21 investigation samples were selected from Daozhen, Hezhang, Pu'an, Pingba and Jinsha, and 317 samples wood data were investigated according to 8 diameter steps,among which 240 were constructed and 77 were tested. According to the technical specification for root diameter standing volume table and six mathematical models commonly used for root diameter standing volume. Taking the weighted least square method of ForStat 2.2 statistical software, the best model of Cryptomeria fortunei diameter volume table was selected by comparing and evaluating the fitting effect of 9 indexes such as sum of squares of deviations, correlation index and total relative error. The volume model of Cryptomeria fortunei has some guidance for estimating the volume of Cryptomeria fortunei, but the result is limited because only one variable of ground diameter.Under the condition that the ground diameter, diameter at breast height and tree height are all limited, it is recommended to use the binary standing timber volume model of Cryptomeria fortunei.

Key words: Cryptomeria fortunei, ground diameter, volume table, preparation