As a teaching mode of junior high school mathematics, mind mapping has been attached importance to and used by more and more teachers. In a way of closely connecting relatively independent knowledge points, it makes indepth exploration of abstract mathematics, optimizes the number and form of mathematics, which is conducive to students’ indepth learning of mathematical knowledge, and improves the quality of students’ mathematical learning and classroom efficiency. This paper explores and analyzes the application of mind mapping in junior high school mathematics unit teaching—taking Parallelogram as an example.