The evolution of educational technology adopted in the classroom teaching

In this article,the authors have elaborated the evolution of the educational technology adopted in the classroom teaching by discussing the concept and evolving process of educational technology.In the course of its evolution,the great development of the productive forces and the scientific technology has played an important part.Meanwhile a preliminary exploration of the different types of classroom-teaching designs has been made from the perspective of the educational technology,which will lead to the change of teachers'role and status.