As an important theoretical basis of intercultural communication, Communicative Approach has been developing and developing continuously since its publication, exerting an increasingly profound influence on foreign language teaching. However, since Communicative Approach is a combination of multiple theories, there has always been a certain degree of confusion about its concept and content. Through the literature research method and the investigation method, based on the basic theory as the point of view of the theoretical discussion. The theory of Communicative Approach is developed with the support of a variety of excellent theories, and theoretically it is reasonable. According to the empirical survey data in foreign language teaching practice, the effectiveness of Communicative Language Teaching can promote learners' independent learning and improve their communicative competence and social cooperation ability. Due to localization and other problems, the theory was once questioned. But compared with its adaptability and other problems, more important thing is how to effectively apply the theoretical core point to teaching practice.