A survey of the forests of AKAMATSU (Japanese red pine ; Pinus densiflora Sieb. et Zucc.) that are widely distributed in Japan reveals that generally in high class stands on fertile soil the lower story is overgrown with broadleaved trees, while the stands growing on poor soil that suffered repeated destructive lumbering present an aspect of nearly pure stand AKAMATSU and have poorer increment. Even on one mountain, the high up-hill, the poorer the productive power, and at lower half of the mountain the lower story of AKAMATSU is overgrown with broadleaved trees, but the up-hill side in many cases forms pure stands of AKAMATSU. Judging from these observations, the treatment aiming at preservation of productive power of soil and improvement of pro ductivity of AKAMATSU forests should not be the formation of pure stands but should be the formation of middle forest type AKAMATSU forests with the lower story overgrown with broadleaved trees. However, the treatment of AKAMATSU forests studied and put into practice in the past was mostly formation of pure stands by clearcutting system. Through his studies of actual conditions of middle forest type AKAMATSU forests, and tests and studies of appropriate methods of forestation continued over twenty-five years, the author established a treatment which he named clearcutting middle forest and made it clear that the system had many long points as compared with the clearcutting system which has been practised in the past. The present paper in ten chapters summarizes the results of the author's studies, clarifies the productive organization of the clearcutting middle forest system applied to AKAMATSU forests, and shows the basis for the treatment of AKAMATSU forests.