“数学实验”作为一种有效的学习方式,在一定程度上改变了“教”和“学”的方式,根据具体的教学内容有效地选择“数学实验”这种学习方式,能让学生亲身经历真实的学习过程,体验知识生成轨迹,理解并掌握知识脉落结构,掌握新知学习技巧。本文以《圆的周长》例谈操作性实验实施步骤。一、创设情境、提出猜想 Mathematical experiment as an effective way of learning, to a certain extent, changed the way of teaching and learning, and effectively selected mathematical experiment according to the specific teaching content. Learning methods allow students to experience the real learning process, experience the trajectory of knowledge generation, understand and grasp the structure of knowledge pulse, master new learning skills. In this paper, “the circumference of the circle” to talk about operational steps to implement experiments. First, create situations, make conjectures