Abstract: By using linearization method of the non-linear function, the anti-J-curve as traditional natural forest diameter distribution is transformed into a linear form, and the visual performance of the straight-line parameter variety is explored. After doing linear fitting on 123 fixed test forest stands from the natural forest in Changbai Mountains, we get the average correlation coefficient as 0.98. This figure shows that it is feasible to express natural forest diameter distribution as linearization expression. The selective plants for cutting and the predicted diameter distribution before and after logging can be designed by using parameters. Parameters in the design of selective cutting of natural forests are very operable. The research results can provide a basis for the natural forest management and selective cutting operation in particular.

Key words: nature forest, diameter distribution, selective cutting, linear expression