Abstract：Research on the application of information technology of Big Data in Chinese digital library PurposeThrough the case analysis of Chinas digital librarythe purpose of this paper is to make readers understand the development statusachievements and problems of Chinas digital libraryAt the same timeit also enables readers to understand the common application forms of these modern information technologies in digital librariesso as to provide a reference basis for the application of new technologies in other countriesdigital librariesDesignmethodologyapproachOn the basis of literature reviewthe authors have analyzed a conspicuous collection of related papers in order to make a comprehensive summary and elaboration on the present situation of modern information technology application in Chinese digital librariesFindingsThis paper defines and analyses the conceptscontents and relationships of the three most important modern Big Data information technologiesand then completes the analysis of the current situation of the application of information technology in Chinese digital librariesThe block chain can achieve more accurate information collectionmore secure information storage and more effective information disseminationArtificial intelligence can improve the existing digital library service level in three aspectsresource constructioninformation organization and information serviceInternet plus will help transform the traditional digital library business mode in order to adapt to the change of user-centered serviceOriginalityvalueThis is among the first structured attempts of comprehensively and generally summarizing the application of modern information technology in Chinese digital librariesIt also contains an original exploration of the relationship between the main kinds of modern information technologyBased on thisa relatively complete application scenario and possible vision of modern information technology in digital library can be built Library AutomationCollection ClassificationRetrieval and IndexingConsulting Services This article mainly explores the application of modern big data information technology in digital libraries in Chinaespecially blockchainartificial intelligence and Internet plusAmong themartificial intelligence has improved in three aspects of digital library servicesresource constructioninformation organization and information servicesData exploration is a technology related to large datawhich is mainly used to extract useful information and patterns from large data sets