公共图书馆事业的核心理念和最高使命在于保障公民的知识自由,但是自公共图书馆诞生之日起,审查制度就与其相生相伴。为此国际层面及国家层面的图书馆组织纷纷在知识自由政策以及图书馆员职业道德准则中对审查制度予以反抗。在实践中,公共图书馆通过利用知识自由声明和馆藏发展政策、移动或重新归类文献及为含有争议内容的文献提供警告等措施应对审查制度的挑战。 The core concept and the highest mission of the public library are to protect the citizens’ freedom of knowledge, but since the birth of the public library, the censorship system has been accompanied by its own. For this reason, the library organizations at the international level and at the national level have opposed the censorship system in the policy of freedom of knowledge and the code of ethics of librarians. In practice, public libraries respond to the challenge of censorship by taking advantage of the freedom of expression and collection development policy, moving or reclassifying documents and providing warnings for documents that contain the content of the dispute.