This study was to explore effects of stepwise visualization on geometry learning for eighth grade students with learning disability. The content is mainly quadrangle, based on Geometric Development Theory to understand the cognitive abilities that students may have in the learning process, and then compiled through PowerPoint textbooks, the textbook content is also arranged according to the principles in the Cognitive Theory of Multimedia Learning and the Cognitive Load Theory, and the research method is Single Subject Research. The research method analyzes the performance of three students at different stages. Then, it cooperates with the interview records to observe the students' understanding of learning and myths. From the results of this study, the analysis is as follows: (1) Students’ quadrilaterals learning has immediate results. (2) The students are effective in maintaining the learning of the quadrilateral.