Abstract:  With the advancement of information technology, the digital transformation of libraries has become a key avenue for enhancing service efficiency. During this transformation process, information security issues have become increasingly prominent, posing threats to the protection of library resources and the security of user data. This study is to address the information security challenges in the digital transformation of libraries by proposing a comprehensive information security protection system. By analyzing the main information security risks faced by libraries currently, including cyber attacks, copyright disputes, insufficient security awareness among management personnel, and low levels of resource sharing, a four-tier information security protection system is constructed consisting of the user application layer, service platform layer, data center layer, and infrastructure layer. This system can effectively enhance the security and access control of library information resources, and strengthen the security of digital resource access. In the process of digital transformation, libraries must consider information security as a core factor, and build a comprehensive information security protection system through the collaborative work of technology, management, and organization to ensure the security and efficient use of digital resources.

Key words: library, digitization, information security, global informatization