Abstract: ［Purpose/Significance］Ancient China was a country  of early-matured library practice and theory. Ancient Chinese people independently explored an approach with their own characteristics to understand the library theories and practical methods in an almost completely enclosed environment. These practical and theoretical achievements are what Liang Qichao called "Chinese Library Science". This study is just an inductive study on these ancient Chinese library thoughts. ［Design/Methodology］Ancient Chinese people autonomously proposed many ideological categories of library science. This research selected five of them for elaboration. Firstly, writing books are meant to convey truth, and the truth is recorded in books; secondly, collecting books is to  educate people; thirdly, reviewing literature is to show the truth; fourthly, seeking truth from facts, and leaving the question open; fifthly, if you love your books, you should spread them. ［Findings/Conclusion］It has been found that  thoughts of the ancient Chinese library science are  highly professional and philosophical, which are not inferior to the Western library science theories at all. ［Originality/Value］Thoughts of the ancient Chinese library science still have great significance of inheritance and reference for the construction of modern library theories.

Key words: Ideology of library science, Category of ideology, Ancient times, China