Abstract: Affordance theory is a groundbreaking ecological thought put forward by Gibson， who solved the ecological unity of human beings and the environment from the micro-psychological mechanism， and constructed the embodied interaction between human beings and the environment at the perceptual level. Environmental design around human beings and the environment should fundamentally absorb Gibson's ecological thought， and the environmental design based on affordance is an expanding mechanism to predict the human-environment ecological relationship， which presupposes appropriate natural and social affordance in the environment. The understanding of the ecological nature of environmental design should start from human beings' naturalness， taking human's natural behaviors and natural emotions as the fundamental purpose of design. It is clear that the purpose of ecological design is to return to the correct ecological position of people at the body level.

Key words: ecology, affordance, environmental design, interaction, naturalness