备课是教师的基本功 ,是上好课的前提 ,也是教学六认真的要求之一。在多年中学生物教学中 ,我始终把备课视作教好书的首要环节 ,并注意把握以下四条原则。1　把握“三点”———知识点、重难点、注意点生物教材由众多的知识块组成 ,每章节教学内容都有其较为独立的若干知识点 , Preparing for class is the basic skill of teachers. It is a prerequisite for good classes and is also one of the requirements for teaching. In many years of secondary school biology teaching, I always regard preparing lessons as the first link in teaching a good book, and pay attention to the following four principles. 1 Grasp the “three points”—knowledge points, difficulties, and points of attention Biology textbooks consist of a large number of knowledge blocks. Each chapter of the teaching content has its own independent knowledge points.