Abstract: The development logic of technical artifacts is the transformation between ecology and non ecology on the basis of affordance theory， which explains that technical artifacts undergo three stages—the core development stage of instrument， the core development stage of action machine and the intelligent artificial tool. Technical artifacts taking instrument as the core are the combination of organic (body) and inorganic technologies， which belong to the bud of the non-ecological technology system. Technical artifacts taking action machine as the core represent the formation of the non-ecological technology system. Intelligent artifacts， which move from body movement replacement to intelligent replacement， haven't changed their essence of non ecology. Accordingly， the development bottleneck of intelligent artifacts is how to solve their ecological existence.

Key words: technical artifact, affordance, non ecology, artificial intelligence