The emergence of Social Epistemology and its bloom arouse the wave of modern Epistemology’s socialized studies,but the contents of these studies are totally different,and the subjects and characters under this title are various as well. This article tries to clarify the concept of Social Epistemology and interpret the relationship between traditional epistemology and Social Epistemology. Summing up continued study,replacing study and parallel study respectively,this article reveals the sociological and philosophical research routes of these studies,and expounds the research characteristics of four different meanings. And then it interprets some main questions in this area according to these studies,so as to expound the core connotation of Social Epistemology exactly.