The design science is not a new discipline but its contents undergo a change in the recent decade. Its focus changes from a coverage of almost all aspects relevant to the design process and the product design, to related scientific theories and methods. The frontier of the design science is to develop systematic theories and methods of design as a science. The Design Society launched a new journal named "Design Science" with an editorial article "Design Science:Why, What and How", and a discussion of 29 authors on the design science, which are reviewed in this paper.