Generally speaking, "education is growth", "education is life" and "education is the reorganization or transformation of experience" are interrelated and inseparable, and they form various angles about the essence of education around "experience". Generally speaking, "education is growth" focuses on the essence of education from the psychological point of view to solve the problem of educational methodology, which provides a basis for "child-centered theory" "Education is the reorganization or transformation of experience" focuses on the essence of education from a philosophical point of view, thus solving the problem of how to acquire knowledge and experience and the coordination between psychological factors and social factors. Both of them are embodied in Education is Life, which focuses on the essence of education from the perspective of sociology. It can be seen that Dewey's theory of the essence of education is different from the commonly said "endogenous theory" and "exogenous theory", and his views are very unique.