What’s the role of technology and media in human society? Can the existence of human beings isolated from technology and media be perfect? How does the real world,in contrast with the Platonic world,involve in the space-time format programmed by technology and media? This paper tries to discuss Marshall Mc Luhan and Régis Debray ’s different notions space-time based on their different understandings of the media. Mc Luhan focused on the spatial dimension. Debray emphasizes the transmission of doctrine and faith,analyzes the key role of social organizations in the transmission,and focuses on the time dimension. Although Mc Luhan and Debray move in different paths,they intersect at the point of technology in rethinking humanism.