Abstract: The ecological factors influenced the way of cutting and regeneration of the tropical mountain rain forest was discussed. Basing on the investigation on characteristics of water and heat regime, the authors tried to build a model of high-yielding forest for the tropical region of China. The paper also explained the effect of the forest on the environment, depending greatly on the forest structure. It was relevant to the growth of younglings and self- restoration. Loss of water and erosion of soil in the clear cutting land were very serious, even if the native tree species from original forest were adopted for afforestation in such area, they were unable to grow well in such a changed environment. The importance of protecting climax community was well shown.