Abstract: Megamachine is a core concept of Lewis Mumfords philosophy of technology， through which he summarizes the essence of modern society as well as the living conditions of modern men， and reveals the origins and nature of modern technology. Mumford explores the historical development of megamachine， and points out that megamachine is closely related to megatechnics and war machines. As a modern version of ancient megamachines and a product of the two world wars， megamachines have inflicted tremendous destruction and harm to humanity， which ignore life and turn modern people into organized men， replaceable men and lonely crowds. Moreover， mechanized men have become a reality rather than the humanization of machines.

Key words: Lewis Mumford, megamachine, megatechnics, war machine