In teaching mathematics, teachers are supposed to assist their students in understanding and elaborating their mathematical ideas as far as possible in response to students' achievement, disposition, and soon. However, the teaching only anchored in the logic of teacher never can open up the heart of student,even if its process and product are "attractive" for teachers mathematically.On the other hand, the teaching flattered students' ideas is bound to end up the activities of low mathematical quality, and finally never can open toward mathematics.