随着科学技术的进步,教师越来越依赖于多媒体课件教学。丰富的多媒体课件,开阔了学生视野,也为教师提供了方便,避免了教师因粉笔字不好而怕出丑的尴尬。板书在教学中自然受到了冷落。事实上,板书是课堂教学中常用的直观教学手段之一,是口头讲授、教具演示的重要辅助工具。若板书设计恰当、巧妙,不仅能增强学生大脑对事物识记、保存的能力,而且有利于帮助学生大脑皮质条件反射的建立和巩固,在课堂教学中 With the progress of science and technology, teachers rely more and more on multimedia courseware teaching. Rich multimedia courseware, broaden the horizons of students, but also for teachers to provide a convenient, to avoid the teachers because of bad chalk fear scandal embarrassing. The blackboard in the teaching of nature has been neglected. In fact, it is one of the most commonly used visual teaching methods in classroom teaching. It is an important auxiliary tool for oral teaching and teaching aids demonstration. If the blackboard design is appropriate and ingenious, not only can enhance students ’ability to recognize and preserve things, but also help to establish and consolidate students’ reflexes in the cerebral cortex. In classroom teaching