Tangram is a classic geometric enlightenment teaching tool, consisting of 5 triangles, 1 square, and 1 parallelogram. The edges of the panels can be pieced together, and the material is mostly wood or plastic. In teaching, by piecing together shapes, students are helped to understand basic geometric shapes and features, as well as comprehend the combination and decomposition of shapes. Like piecing together animal and character shapes, perceiving the spatial relationships between shapes. Creative collage competitions can be held to stimulate imagination. It can cultivate observation skills, spatial thinking, and hands-on abilities, making it an ideal tool for integrating mathematics and art teaching in the lower grades.