布卢姆的掌握学习理论认为“只要提供适当的先前与现实的条件，几乎所有的人都能学会一个人在世上所能学会的东西”。这说明后进生是可以转化的。笔者认为，转化化学后进生可从下面几方面入手。要善于对后进生作出积极评价，让他们体会到学好有望。教师任何含有评价意义的行为 Bloom’s theory of mastery and learning states that “as long as proper conditions of prior and reality are provided, almost everyone can learn what a person can learn in the world.” This shows that backward students can be transformed. The author believes that the following aspects can be taken into account in the conversion chemistry. Be good at making positive assessments for later students and let them realize that learning is a good prospect. Any behavior of teachers with evaluation significance