The theoretical research of Library Science in China has achieved fruitful results,and has played an important role in promoting the development of the world's libraries.However,in the face of the tremendous changes in the information environment in today's society and the consequent tide of library reform and transformation,the whole theoretical research is eager to make new breakthroughs in epistemology and methodology.The key to this breakthrough or the most important problem,is the epistemological reflection on the basic theory of Library Science.From the perspective of philosophical think...