The development of knowledge industry heavily depends on substance of knowledge; it improved the human living and culture. It also inspired issues on the freedom of knowledge and culture management. Public libraries play essential roles of transforming human knowledge and culture. It also retains social functions of equal circulation of common knowledge. However, at current status, facing the debate of knowledge commodities and knowledge freedom, so as knowledge specialized and knowledge-deepened issues, this paper submit the idea that public library is one of solutions for the debate; at the meantime, public library will become an invisible push-hands for closely insert into people's life networks.