作为教师,我们都知道教什么比怎么教更重要,而对教材的理解和使用是搞清楚“教什么”的关键。因此,教师通过解剖教材体系、挖掘教材内涵,从数学本源上进行教学,可以有效促进学生思维的建构和发展。对此,本文试通过对从2014年9月全面铺开使用的人教版教材中新增的、年段调整的、板块变化的一些课例的分析,来谈一下如何基于新教材实施 As teachers, we all know what to teach is more important than how to teach. Understanding and using the materials is the key to figuring out what to teach. Therefore, teachers can effectively promote the construction and development of students’ thinking by dissecting the textbook system, mining the content of textbooks and teaching from the origin of mathematics. In this paper, this article tries to analyze how to implement the new teaching material based on the analysis of some newly-changed, period-adjusted and section-changing cases from the PEP teaching material that was fully used in September 2014