Abstract: [Purpose/Significance] ChatGPT, an artificial intelligence chat robot based on transformer neural network that was developed by OpenAI, has now leveled up to GPT-4 and GPT-4 Turbo. solves the problem of peer-to-peer response in human-computer interaction with its powerful natural language processing ability. Its abilities of information retrieval, language organization, logical reasoning and text induction meet the needs of library users, which makes the transition from a traditional library to a smart library with a return to knowledge service possible. The paper focuses on the development trends in the library field in the era of artificial general intelligence. [Method/Process] Based on the background of the library development in the computer age, the paper reveals the dilemma of library knowledge service through retrospective and comparative methods, pointing out the endogenous growth value of ChatGPT's high-quality analysis, demonstration and generation ability with multi-modal and full-scene deep interaction for smart library services. Library service presents a new mirror image from the perspective of ChatGPT: intelligent retrieval covers all traditional service, while the focus of information consultation, subject service and reading promotion shifts and the service margin becomes blurred. Information consultation retains the necessary share of traditional consultation, and becomes professional and focused; subject service moves forward to the frontier of all-disciplinary field; reading promotion realizes the accurate docking between the collection and the target population. The potential risks and challenges posed by ChatGPT include copyright risk and secondary institutional copyright risk with plagiarism, simulated viewpoint and the exposure of data. This urges the society to regulate the development behavior of technology companies through legislation, and requires third-party supervision and local area networks to ensure security. [Results/Conclusions] On the basis of saving human resources and management costs, ChatGPT accelerates the optimization of traditional library services, improving service quality and efficiency. It may facilitate the transfer and reorganization of traditional library services, but this does not necessarily lead to the end of the library industry. On the contrary, it makes possible for the library industry to return to the knowledge service with the blessing of new technologies. It is inevitable to consolidate divisions, streamline personnel and rebuild teams, but the process may not be perceptible or even dramatic. The service standards and evaluation system of the library industry change from borrowing and returning books, click rate and pageview to the depth and efficiency of teaching and scientific research participation. Knowledge service becomes clear and conscious. The threat of digital books and electronic reading has been greatly reduced, making it easier for the library industry to confirm its position in the social and historical development.

Key words: ChatGPT, library, traditional service model, AIGC, field trend