“凡事预则立,不预则废。”课堂预设可以说是教师对课堂教学的规划、设计、预设和安排,既包含教师对教材、学生的理解,更体现教师个人的教学理念和教学风格。教师只有课前进行充分的预设,才能在课堂上临危不乱,“运筹帷幄之中,决胜千里之外”。如果我们把课堂教学看做一个充满张力的生命过程,那么预设既是课堂教学的孕伏过程,又是课堂教学的基石和源泉。课堂教学的好坏、效率的高低,与预设的有效与否直接相关。高效的课堂教学离不了精心的预设,只有课前进 “Classroom presupposition can be said that teachers in the classroom teaching planning, design, pre-set and arrangements, including both teachers of textbooks, students’ understanding, but also reflects the individual teaching of teachers Idea and teaching style. Teachers only pre-class full pre-order, in order to chaos in the classroom, ”strategizing among the winning thousands of miles away." If we regard classroom teaching as a life process full of tension, then the presupposition is not only the pregnant process of classroom teaching but also the cornerstone and source of classroom teaching. Classroom teaching is good or bad, the level of efficiency, and the default is directly related to the effective. Efficient classroom teaching can not be meticulous preconception, only the progress of the class