Image is the main body of the situation, and the simulation in the situation teaching should be based on the image in the model essay and the image needed for teaching, and the image in the situation should also be consistent with the students' knowledge and experience. Situational teaching method introduces or creates many vivid scenes in the teaching process, that is, it provides students with more perceptual objects, increases the knowledge units in students' brains, helps students to generate inspiration, and also cultivates students' similar thinking ability.