“先学后教”突破了传统教学模式中教师一味向学生传输知识的局面,学生在课堂教学中的主观能动性得到了充分发挥,在学生思维能力、解决问题能力、自主学习能力等的培养方面能够发挥积极的作用。初中化学对于很多学生来说都具有一定的难度,教师在教学过程中运用“先学后教”教学模式,可以提升学生学习兴趣,降低学习难度,增强学习效果。 “Learning before teaching ” breaks through the traditional teaching model in which teachers simply transmit knowledge to students. Students ’subjective initiative in classroom teaching has been brought into full play. Students’ thinking ability, problem solving ability and autonomous learning ability etc. Cultivation can play a positive role. Junior high school chemistry for a lot of students have a certain degree of difficulty, teachers in the teaching process using “pre-school teaching” teaching mode, you can enhance students interest in learning, reduce learning difficulty and enhance learning effectiveness.