With the gradual deepening of the application of artificial intelligence (AI) technology in various social fields, especially the rapid development of generative AI, society has entered a new stage of intelligent transformation. How libraries, as important carriers of cultural services and innovation, fulfill their missions in the context of AI is an important proposition that libraries should consider at present. From the perspective of scenario analysis, this paper analyzes the challenges and corresponding countermeasures faced by library services in four scenarios: the proper use and governance of AI, consumption - oriented applications, laissez - faire applications, and autonomous decision - making applications. Then, it proposes universal development strategies for libraries against the backdrop of the rapid development of AI, namely advocating and actively practicing responsible AI, formulating literacy improvement plans to address the new digital divide, and participating in the design and research of library AI projects.