立体几何的一个主要难点，是由画在二维平面上的图形想象出三维空间中的几何关系。学习立体几何的过程也是逐步培养学生的空间想象能力的过程。培养学生空间想象力的一个有效方法，就是做好由模型到图形的过渡。１．让学生自制模型 立体几何知识比较抽象，学生仅凭语言、文字 One of the main difficulties of the three-dimensional geometry is to imagine the geometric relations in three-dimensional space by the graphics drawn on the two-dimensional plane. The process of learning solid geometry is also a process of gradually developing students’ spatial imagination. An effective way to cultivate students’ spatial imagination is to make a transition from model to graphics. 1. Let students self-made models Solid geometry knowledge is more abstract, students only rely on language, text