Within the forest inventory of Jeju, the national forest has been rich relative to the average national inventory; however, the private forest has formed merely half of the average national area, and the circumstances for forest management were also demonstrated to be poorer than those of the average national forest management. In the organization of age classes, the rate of schonungen kulturen is relatively lower. Thus, it will lead to an unbalanced growth in the forest and hurt its stability, provided that there is no improvement in the age class` structure, which would make it hard to begin sustainable forest management (SFM). Also, the acreage of forest owned by private forest owners was shown to be only half of the national average. Therefore, it appears to be necessary to introduce collectivism into forest management. The forest management plan establishment rate is merely 1.7%, and it is supposed to create active support for building forestry management plans. After analysis, it was decided to pursue the extension of the forestation area, which is only about an average yearly 100ha, for the forestation of a sustainable forest inventory. It would also be necessary in the forestation of tree species to conduct forest management in consideration of sightseeing by selecting tree species specified for local features. The area in Jeju appropriate for tending as a forest proved to be 2,495~3,209ha, and the producible growing stock proved to be 41,717~62,577m3.