Metaphor analysis is based on the belief that metaphor is a powerful linguistic device, because it extends and encapsulates knowledge about the familiarity and unfamiliarity. Metaphor analysis has been adopted in the educational discourse. The paper categorizes the previous relevant research into 3: interactions between learners and institutions, teachers' perceptions of teaching and learners' beliefs of learning. And a critical review of 3 kinds of studies and suggestions for further research are ensued.