Abstract：Neil Postman, a famous American media ecologist who put forward the thesis of “Technology Monopoly”, pointed out that the culture is going to yield to technology so that everything will fall as its servant. Firstly, the author explained the background and meaning of Postman' s “Technology”. According to the development of media technology, Postman divided the history of culture into three periods:the period of tool-use culture, the period of technical domination culture and the period of technical monopoly culture. The world today is transforming to the third period. It is increasingly clear that the traditional symbols in history and the classical culture are in danger. However, it is Postman' s path of media criticism and Heidegger' s philosophy in Questions on Technology are the ways of human self-salvation to prevent this torrent. Only to criticize and notice the harm which the technology might cause and ask the nature of technology at all times can keep the human spirit independent and free.

Keyword：Technology Monopoly;Postman;traditional symbol;thinking of technology;Heidegger;