Library science focuses on information management and service, and information science focuses on information system, which is a major that focuses more on science and engineering. Information science is a science that studies the law of information generation, transmission and utilization, and uses modern information technology and means to keep the information circulation process and information system in the best efficiency state. It is a new interdisciplinary subject between technical science and social science, which gradually formed after the Second World War. It helps people make full use of information technology and means to improve the efficiency of information generation, processing, storage, circulation and utilization.