对教材的改革是新课程改革的一个重要特点。在使用教材的过程中,我们可以深刻地感受到编者在编排这些教材的时候,对于同一知识体系内的知识的编排都体现了“螺旋上升”这一特点。显然于编者而言,这样形式的编排是为了适应儿童的认知规律,便于他们循序渐进地构建自己的数学认知 The reform of teaching materials is an important feature of the new curriculum reform. In the course of using teaching materials, we can deeply feel that when arranging these teaching materials, the editor of knowledge in the same knowledge system embodies the characteristic of “spiral rising”. Obviously in the editor, this form of arrangement is to adapt children’s cognitive rules, so that they gradually build their own mathematical understanding