Faced with the irrational application of science in the war and based on the deep understanding of Marx's concept of practice，Benal rebels the practice of traditional philosophy of science，concentrates on a social practice of science and develops a full range of social studies of science. The traditional western philosophical science theory focuses on the effort of science and the knowledge of science. Such Theory ignores the reality of life and depicts the outlook of science. Bernal's social practice centers on the basis of science with details and open-minded ideas and history，which initiates the social practice turn of science study. Bernal's research theory originates from practical issues and finally returns to dealing wish real problems. In summary，concentrating on knowledge of science and turning to the social practice of science is the research path of returning to life-world一philosophy angle.