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The theory of teaching is becoming scienclization under the pattern of science.It gives birth to teaching-method.From the philosophy of teaching-method,it is technology that is denoted by its purpose and its procedure.The aim is to operate on teaching and its belief is what its procedure is able to guarantee its purpose.In fact,teaching-method has an internality paradox and an externality paradox.The practice of teaching-method shows that the paradoxes exist.The internality paradox is represented between the procedure and the purpose which is to cultivate individual;the externality paradox is manifested between the teaching-method which is simple and its object which is complex.So we must de-structure the teaching-method from life-world,because every one lives and shapes in life-world.In life-world,one communicates other,and communication is basic way of life,so dialogue is a basic mechanism as teaching way in systemlized classroom.