Abstract
The rate of mountainous area population outflow has been extremely high since 1960 and this trend will continue for a long time to come, changing the most basic structures of moutainous area communities. This phenomenon invites low growth rate of the productivity of the mountainous area industry, ineffectiveness of social public investment and eventually collapse of the community. This national diseconomy and many social problems mainly derive from the excessive scarcity of popula-tion. 1) In this paper the factors which affect the population outflow are analyzed by the quantification method, making it clear what social environmental features affect the outflow. 2) The analysis is made at two phases: phase 1 at the stage of towns or villages, and phase 2 at the stage of hamlets. 3) The factor items are chosen from the view point of location, agricultural or forestry resources and their ownership or utilization, social or economic environment, structures of towns or villages. 4) The outsider is the decreasing rate of population from 1960 to 1970. 5) By means of these items, considerable part of population outflow is statistically explained, and 6) The results of the factor analysis show that the items which strictly affect the population outflow are the rate of forestry farm and the rate of middle scale forestry farm at phase 1, and the average agricultural acreage of farm-land and the rate of paddy field at phase 2.
