培养小学生初步的空间观念,是小学数学教学目标之一,而空间观念的形成与几何初步知识的教学密不可分,学生对几何形体的再现对周长、面积、体积的计算,往往离开这些几何实体,而依赖于头脑中对物体的形状、大小和相互位置关系的形象反映,这就要求学生必须有一定的空间观念。因此, It is one of the goals of primary school mathematics teaching to cultivate the primary space concept of elementary school students. The formation of spatial concept is inseparable from the teaching of geometric primary knowledge. The calculation of perimeter, area and volume of students’ geometrical representation often leaves these geometric entities , But relies on the image of the object in the mind shape, size and mutual positional relationship, which requires students to have some space concept. therefore,