Library science is an ancient and young science with a long history and broad prospects. With the coming of the information society, the library cause will get unprecedented development, and the library work will play a more important role in serving the economy, politics, culture, education and scientific research. Using the library to obtain information and knowledge will always be an indispensable way of life for human beings. History will prove that library science will not completely belong to the cause of library and librarians in the end. It will comprehensively and profoundly reveal the laws of collecting, sorting, retrieving and utilizing documents, information and knowledge, and become a science with methodological nature that everyone must master.