Misunderstanding of the partner's ideas and intentions is quite a common condition in the design communication process between the client and architect, because of the ”Asymmetric information” phenomena which come from different professional training for librarians and architects. Three hundred sixty five librarians are investigated with questionnaires. The statistic method-Confirmatory Factor Analysis method is applied for analyzing librarians' categorization of the themes for library building design, as well as the themes, could be assigned to either the librarians' or architects' domains, and categorization of design communication information, and the presentation of professional typical messages into the architectural requirements for proposal. The appropriate defining of typical messages should form an effective communication base to help librarians and architects to set a good library programming to meet their needs.