Communicativeness is the chief characteristics of human cognitive behavior. Communicative activities impel mankind to form cognitive structure and help to develop human cognitive competence. Social phenomena differ from in that the society is the outcome of human activities and the result of meanings, and is explicated by language. In the integration of socialized forms in human behavior with the vast system of meanings in the society language occupies a unique position. The existence of conventions is not only inevitable in various forms of the social world, but the convention also possess the most important communicative and cognitive function. It is impossible to apply the research method of natural science without taking the conventional choice into account in linguistic science and humanities. Lacking conceptual basis and operational mechanism, there is no possibility to verify a hypothesis directly in the process of applying linguistic theories to experiential language materials. The current challenge in cognitive linguistic theory is how to solve the large number of problems of explicit and intrinsic social and psychological conventions.