Abstract: 【Purpose/significance】By analyzing the content characteristics and the development context of library laws and regulations
in China in recent years,this paper explores its development trend,so as to provide a reference for the research of library laws and regu? lations and the construction of library legal system【. Method/process】Taking CNKI as the data source,the full text of laws and regula? tions in laws and policy documents in China Library Yearbook from 2008 to 2018 is selected as the research sample, and the LDA model is used to extract and mine the subject content.【Result/conclusion】Through the theme research,it is found that there are few special laws and regulations in China's libraries and their implementation is late.We should strengthen the research of special laws,
promote the promulgation of comprehensive library law and speed up the construction of library legal system.【Innovation/limitation】 Using LDA subject modeling method to analyze the subject data of a large number of present library laws and regulations,and explore the content characteristics and the development mechanism of library laws and regulations is of innovative significance.For the reason the word segmentation method in the algorithm may have partial deviations in the segmentation of individual professional vocabulary,it will have a slight impact on the accuracy of keyword extraction.