As exclusive socialized behavior of human beings, Design-activity contains rich social human-factors. Firstly, we take Design-activity as the noumenon, and we comment on three classical modern architectural works in order to elicit some design questions. Secondly, we analyze the structure of Design-activity including the definition, the organization and the programs of design. Finally, it’s indicated that a general format of Design-thinking planned to provide full catering services to people is coming into being in the field of Design-methodology in contemporary era, and the format is to find the problems concerning people’s requirements firstly, then to solve them by using Design-activity