First, from the teacher's point of view, first of all, we should study the teaching materials, read out the original intention and new ideas of the teaching materials, grasp the essence and difficulties of the teaching materials, internalize the teaching materials into our own things, have the depth to go in and have the courage to jump out, which is the premise to promote and capture valuable generation in the classroom; Secondly, we should broaden our knowledge and enrich our background knowledge.

Secondly, from the aspect of teaching materials, we should emphasize the basic position and main role of teaching materials. The premise of transcending the textbook comes from the textbook. We must have a comprehensive and accurate understanding of teaching materials, truly understand the original meaning of teaching materials, respect the value orientation of teaching materials, and on this basis, combine children's experience and the development of the times, explore and pursue the extended meaning of teaching materials, and form students' personalized interpretation.

Thirdly, in teaching, we emphasize careful presupposition, predict and consider the possibility of students' learning activities as much as possible before class, reduce the "generation" of low level and predictability, and stimulate the generation of high level and wonderful.

Second, take generation as the guidance, and improve the pertinence, openness and variability of presupposition.

First, we should take the subjectivity of generation as the guide and improve the pertinence of presupposition.

Relatively speaking, generation emphasizes students' activities and thinking, and it highlights students' subjectivity; Presupposition emphasizes the design and arrangement of teachers, which embodies the dominant position of teachers. Teaching for learning means presupposing according to students' learning foundation and learning rules, thinking about students' thoughts, preparing students' thoughts, and making presuppositions targeted.

Secondly, the randomness (unpredictability) of generation is the direction to improve the openness of presupposition.

Generation is the "improvisation" of teachers and students, and it is the "beauty that cannot be preserved". It's like an unexpected fantasy. Therefore, presupposition should be flexible and open, leaving room for generation. In traditional teaching, teachers are used to taking everything in class into account and excluding "accidents" and "complications" from classroom heresy, which naturally has no place. Teachers should establish a sense of generation, think deeply about the general direction, main links and key contents of classroom teaching, grasp the overall thinking and goal orientation of classroom teaching, and provide necessary time for students' independent activities.

Thirdly, based on the dynamic nature of generation, improve the variability of preset.

Emphasizing the dynamic nature of generation means that classroom teaching is not the process of implementing teaching plans, but the process of recreating teaching plans; We should not focus on textbooks, teaching references and teaching plans, but should focus on observing students, listening to students, discovering students and actively interacting with them. It requires teachers not to stick to the pre-class presupposition in classroom teaching activities, but to adjust and change the design at any time according to the actual situation.