Abstract: [Purpose/Significance] At the moment of library transformation, using new information technology to solve the difficulties in traditional business and optimizing the reader experience is one of the research contents of smart libraries. We use the cloud edge system technology to design and implement the Shanghai Library mobile phone book lending system, which turns readers' mobile phones into dispersed self-help book lending devices, which is a successful attempt to grafting new technology into traditional library services to solve the difficulties in traditional services and optimize readers' experience. [Method/Process] In this paper, the technology of edge collaboration is applied to the library self-service loan business. First, starting from the problems faced by RFID self-service loan and return equipment in the public library, the prototype system is determined to change readers' mobile phones into self-service book borrowing equipment for readers, so readers do not need to use fixed loan and return machine, or queue up at rush hour. Centering on reader experience, data security and replication and promotion of new services are regarded as the design objectives of the system, to explore the integration of cloud-edge collaborative technology into the system to meet the design objectives (the characteristics of the system users, system performance and the scalability and stability of the system). According to the preset performance indicators, the paper provides detailed analysis and technology selection of the system, with an introduction of what we considered and why we chose the application of the system. Finally we achieve the purpose of reducing cost and increasing efficiency and improving readers' experience. [Results/Conclusions] Out one month after the system went online, about 12,640 books were lent out by mobile mobile phone book lending system, accounting for 10% of the total circulation. Most of them were young readers (ranging from 18 to 50 years old), which showed that the system met the design expectation and reduced the demand for self-service book lending machines in libraries to a certain extent. Through the official launch of the mobile phone borrowing system, the feasibility of the application of cloud edge collaboration technology in the library is verified. Cloud edge collaboration can meet the application scenarios of multiple branch libraries, and has better scalability and stability in the promotion and replication of services. It is better than the traditional system architecture. At the same time, it really reduces the purchase demand of the East Library of Shanghai Library for the self-service borrowing machine.

Key words: smart library, library self-service, cloud edge cooperation, mobile phone book lending