The grinding process generally follows the process of "three standby and two grinding". In this process, the group participates in the discussion together, and everyone examines and thinks about the problems existing in lesson preparation and teaching around problem solving. In this process, teachers can learn while acting, which greatly improves teachers' ability of action research. The improvement of thinking teaching and research teaching ability reflects the professional growth of teachers.

2. The polishing of lesson preparation has improved the lesson preparation level of the research group.

Through active participation, both the speaker and the participants have been promoted. The speaker took out a lesson preparation, which is an exercise in itself. Under the active discussion of other teachers, it is an improvement to absorb the wonderful opinions of others. For other teachers, although they are not direct executors, they listen carefully, think seriously and put forward reasonable opinions. This is a combination of observation and learning. Everyone's reflection on preparing lessons after class is another reflection and research on preparing lessons. Through these three lessons, teachers' ability to prepare lessons can be improved.

3. Listening to lectures can improve teachers' classroom teaching ability.

Needless to say, the lecturer, but as far as the audience is concerned, through the formulation of classroom observation scale, the implementation of classroom observation and the production of classroom observation report, a teacher must have in-depth thinking on all aspects of the classroom, and also know from which research angle to evaluate a class and how to evaluate it.

Because the process of grinding classes is generally carried out around the teaching objectives, the development of teachers in these processes will inevitably help teachers to better implement the curriculum standards and promote the development of students. Therefore, from the perspective of grinding process, it is obvious for teachers' professional development.