Interest is the spark that ignites wisdom and the power to explore knowledge. Because of hearing disability, the language formation and development of deaf students are difficult and slow, so their development in perception, attention and thinking is not as good as that of normal children. Therefore, in mathematics teaching in schools for the deaf, we should always put students first, teach students in accordance with their age characteristics, cultivate students' interest in learning, and let them learn to think, practice and innovate.