The major purpose of this study was to explore the relationships between the social reconstruction and educational policy analysis, and their applications on case study. Two key steps involve in using a social reconstruction to analyzing public social problems. The first one is to look at the rhetoric around the problem and to see how the problem is defined, what language is used, and what images are created. The second is to analyze the historical period in which the problems occurred in order to determine how they are related to other conflicts, stresses, changes, and difficulties. Five perspectives of policy analysis provide multiple examinations in policy analysis. They are rational, organizational, political, symbolic, and normative perspectives. The combination of theoretical background from the social reconstruction and technical method from policy analysis enlarges the view of analysis, and increases the quality of interpretation. The analyses of the case of Mandarin-only policy provide the explanations that the Mandarin promotion movement was not simply a linguistic or educational problem, but more political, economic, and social problems. The disappearing of minority languages is not only the issues of linguistic functionlessness or parental irresponsibility, but more is the responsibility of the society and government.