This study is divided into three main parts, and additionally includes an introduction, conclusion, footnotes and reference books. The first part deals with the historical development of the social philosophy in the period of the Republic of China. It begins from the revolutional ideology created by Dr. Sun Yat－sen in 1895, through the revolution in 1911, and ended in 1949, when the republic government escaped from mainland China to Taiwan on the one hand, it proppounded by scholars on the other. The second part examines the essential contents of the social principles, problems and praxis during this century. Finally in the third part the author attempts a critique on the values and the limitations of this study of the social philosophy in this period.