In the process of teaching a lesson. the step of review plays an important role. Specially, not only does it help learners form a connection between knowledge units but it also creates a lot of interest for learners. Generally, after finishing a lesson. teacher gave a summary of major knowledge. However, this method does not show a modem education opinions, in order to enhance the activities of learners: teach them the way to learn and learning by doing. This article introduces and analyse the meaning of the way of review by using graphs, giving out the process of using them in the step of review, by way of illustration.