对学生而言,“体积”是一个新概念。由平面图形到立体图形,从二维空间到三维空间,是学生空间观念发展的一次重要跨越。教学中,我们该给学生一次怎样的助推,这是一个值得深思的问题。笔者以“体积的认识”一课为例,阐述自己观课后的思考,探寻“多维对比促深度建构”的教学策略。 For students, “volume ” is a new concept. From graphic to three-dimensional graphics, from two-dimensional space to three-dimensional space, is an important leap in the development of student space concept. Teaching, we should give students a boost, this is a question worth pondering. The author takes “Volume of Cognition ” as an example, elaborates on his own thinking after class, and explores the teaching strategy of “multidimensional contrast and depth construction ”.