This report is to illustrate how contemporary Japanese architects make a framework of concept in their design theory with using words of geometrical figures, for example circle, rectangle, cylinder, and so on. This domain of geometry is one of the most spread and important general idea to explain the shape of architecture. Firstly, the content of each article was considered and classified into four categories based on its background context for architecture. Secondly, two types of the form about geometrical operations was considered from their texts. One is the form of spacial recognition of geometrical figures; [plane] or [solid]. Another is the form of simplicity in the number and the variety of geometrical figures; [single], [repetition], and [mixture]. Finally, the relationship between the content of background context for architecture and two types of the form was considered and analyzed totally.