Situation is the "small world" of a class, which is created by teachers with vivid, cordial and touching language, or by describing interesting people, events and scenes closely related to the teaching content, or by using certain media to show vivid and vivid action pictures related to the teaching content. Teachers creatively design certain situations in teaching and let students enter the role in a dramatic way, which can arouse their emotional experience, ignite the spark of their thinking and produce strong feelings. This can greatly stimulate students' interest and achieve good teaching results.