The purpose of this study was to select the evaluation criteria for the physical spaces of a children''s library in an effort to back up children''s development in a more positive and constructive manner, as the physical spaces of a children''s library are likely to affect their development. Theories of children''s developmental characteristics were reviewed, and user benefit criteria were analyzed, which were the basis of the spatial conditions to facilitate their development in consideration of the developmental characteristics of different stages and domains. And then conceptual words that corresponded to the concept of benefit and commonly appeared in earlier studies of children''s libraries and children''s spaces were selected to embody the concept of benefit. 12 conceptual words were presented as corresponding words of benefit, out of which the majority were selected from among the previously selected words and some were added by this researcher. Several libraries were reviewed by the 12 standards, and a spatial criteria checklist for a children''s library that focused on benefits provided to growing children was provided.