Abstract
Forests have two functions; one is for economy the other is for public service. The problem in relation with forest policy is how to make these functions optimally and contemporaneously harmonizing with each other in order to get the maximum utility (or value) from forests. In this paper, KISINE's theory of optimal usage of forests is used to derive a nonlinear programming method (with restrictive conditions), then the method is used to empirically analyse OSAKA's forests. As the results, the values of optimal growth period and optimal division of whole forests area between the economic forests and the public service forests making the utility of OSAKA's forests maximum are found, also the efficiency of the theory is empirically verified.
