Based on the theme “Social Design,” 2015 Taipei Design and City Exhibition intended to evoke the discussion of social design and social consciousness of Taipei. In this study, the author firstly explored the development of social design theories. Then the officially announced core values of the 2015 Taipei Design and City Exhibition were examined from the exhibition and events. Several characteristics and problems were discussed: the human-centered and social integrative emphasis, the way to work out social design, public participation and empowerment, as well as the limit on sustainable practice. Besides, “100 Social Design Proposals” competition was discussed from aspects of the issues and people concerned, and the extent to which the resolution proposed aimed at. Finally, suggestions were offered, including (1) the need to generate strategies that cultivated public participation; (2) a comprehensive plan for assuring sustainable practice; (3) more emphasis on the strategy to changing the mindset and to begin with dialogue among the professionals, the government and citizens from the grass-root communities; (4) cross-sector, multidisciplinary collaboration in order to carry out social design.