Abstract: [Purpose/Significance] The development of 5G technology provides a communication network foundation for the development of big data, cloud computing, artificial intelligence, Internet of things and other technologies, and the application of these new generation technologies will promote the intelligent construction of libraries, so as to improve the quality of information service and enhance user experience. [Method/Process] The evaluation index was preliminarily constructed by the literature review method, and it was revised by the questionnaire survey method. Combined with the characteristics of 5G technology different from 4G technology, the information service quality evaluation system of a mobile library under 5G environment was finally constructed; 16 indexes are divided from four dimensions of resources, demand, environment and efficiency, the weight of each index is determined by analytic hierarchy process, the calculation results are run by MATLAB, and the consistency is tested. Finally, based on the mobile library information service quality evaluation system under 5G environment, this paper puts forward improvement strategies for the development of mobile library information service. [Results/Conclusions] In the evaluation system, the resource factor has the largest weight, followed by the efficiency factor. In the 5G era, mobile libraries need to give priority to using 5G technology to ensure the timeliness of information, remove miscellaneous and outdated information, and broaden the platform for users to obtain information. At the same time, mobile libraries should focus on using 5G technology to ensure the stability of the network and provide users with better information services with lower delay.

Key words: 5G, mobile library, information service quality, analytic hierarchy process