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The problem of Brain Drain is closely related to the sociology of higher education and the sociology of science. Because of its current-topical nature and the scarcity of public concern, the problem of Brain Drain has seldom been explored as an object of study in our country. The purpose of this article is to attempt a sociological analysis of this problem. To solve this problem, its sociological phases are specified as the followings: social mobility; communication system of science; and socio-historical. In this article, social mobility is mainly explored and both qualitative and quantitative analyses are attempted. In the qualitative analysis, which will be an introduction to the quantitative analysis, the nature of Brain Drain is clarified. In the quantitative analysis, the levels and the real states of various countries are explored on the basis of the 1971 report on Brain Drain by OECD. This may reveal the mechanism and function of Brain Drain. In conclusion, we can consider the United States as Brain Gain, Canada as Inter-mediate, England as Brain Drain and Sweden as Re-migration. Further study will be needed from the viewpoint of the sociology of science.