Abstract: Libraries play an important role in promoting the achievement of global sustainable development goals (SDGs). However,  systematic and theoretical research on global library sustainable development practices remains insufficient. This study applies thematic analysis to encode three levels of themes from 61 SDG stories reported on the IFLA Library Map of the World platform. Through processes of conceptualization,  naming,  abstraction,  and integration of the corpus, the study identifies 69 initial categories,  23 main categories and 4 core categories related to library practices that promote sustainable development. It explores practical pathways through which libraries contribute to the achievement of the SDGs. The results suggest that a framework for sustainable development practices in libraries has taken shape,  characterized by an SDG-oriented approach,  a user-centered focus,  multi-stakeholder collaboration,  and innovative service initiatives as key drivers. The library's actions in promoting sustainable development also demonstrate their distinct characteristics. In the future,  libraries need to further clarify their role in sustainable development practices,  strengthen the leading role of library associations and professional organizations,  and enhance the broader social influence of their practical initiatives.

Key words: Library, , Sustainable development, , IFLA Library Map of the World, , Sustainable development goals (SDG) sories, , Thematic analysis