Architectural drawing techniques are the result of creative historic efforts to solve the problem of visualization. Asarchitectural design incurs different problems than the making of naturalized image, architectural drawings exhibits different traitsfrom other forms of representation. This study is an investigation on a new form of architectural design representation on the1970s and 1980s, a period of the emergence of Postmodernism. The objective of this research is to examine how new forms ofdesign representation evolved in response to the conception of the architectural design in Postmodern culture, and how theyshaped the design thinking of Postmodern architecture. In Contrast to the conventional drawings, the conceptual drawings of RemKoolhaas, Peter Eisenmann, Bernard Tschumi, Daniel Libeskind, and Thom Mayne challenge graphic convention, and exploitcontradictions and limits of the architectural graphic medium.