一、改变质地,提高安全系数案例:1节水平二(四年级)的实心球课中,一位教师利用废旧报纸包裹住2个沙包,再用透明胶带缠紧,制作成简易“实心球”用来进行双手前抛实心球的教学,有效地降低了硬质实心球可能带来的危险,学生参与热情也得到了提高。剖析:一些教材,由于器材质硬物重,如铅球、标枪和实心球等,对于低年级学生或者初学者来说,在教学过程中容易发生伤害事故。为此,体育教师可以学习本案例中的做法,根据危险器材的特点和动作技术要领,巧妙地自制较为“安全”的器材,既能降低危险系数,又能提高教学效果。笔者认为,在自制器材或选用替代器材 First, the change of texture, improve the safety factor Case: a level two (fourth grade) of the solid ball class, a teacher using scrap newspapers wrapped two sandbags, and then wrapped with transparent tape, made into simple “solid ball ”Used to teach the hands before throwing the solid ball, effectively reducing the risk of hard solid ball danger, enthusiasm for student participation has also been improved. Analysis: Some teaching materials, due to the material quality hard objects, such as shot, javelin and solid ball, etc., for the lower grades students or beginners, prone to injury in the teaching process. To this end, physical education teachers can learn the practice of this case, according to the characteristics of dangerous equipment and action techniques, skillfully self-made more “safe” equipment, both to reduce the risk factor, but also improve teaching effectiveness. The author believes that in the homemade equipment or use alternative equipment