Recently, social networks theory and methods have been applied in social science and become an emerging research apporach of sociology. Starting from the relational perspective, social network methods analyze realtionship patterns among actors and complement the insufficiency of traditional sociology which analyzes attributes of actors. The article delineates the developing context of social networks theory, dicusses the connections between social networks theory and macro/micro sociology, and examines its contributions to sociological methodology. Finally, this article examplify the latest applications and development of social networks theory in sociology researches.