《普通高中数学课程标准(实验)》指出:“将课程与学习融为一体,要展示知识的生成、发展和形成的过程,提供学生主动探究、亲身体验的机会.”因此,数学课堂应是学生探索世界的窗口.给予学生新的视野、新的启迪比知识本身的传授更为重要.本文试图以《点到直线距离公式的推导》一课 “Ordinary high school mathematics curriculum standard (experiment)” points out: “The integration of curriculum and learning, to demonstrate the process of knowledge generation, development and formation, to provide students the opportunity to explore, personal experience.” Therefore, the math classroom should be Students explore the window of the world, give students a new perspective, new inspiration is more important than the knowledge imparted.This paper attempts to “point to the linear distance formula derivation” a lesson