“图式学习”是学生数学学习过程中的重要学习策略。在面对抽象的数学情境时,引导学生依托线段图、情境图展开自主学习的过程——学生以图式为载体,建构数学学习模式,从而理解并解决数学问题,这就是“图式教学”。“图式教学”的实施,有利于学生找准难点,化复杂为简单,化抽象为具体,化生疏为熟悉,解决数学学习中的困难,形成自己的知识体系,把知识串珠成线,结线为网。一、依托线段图建模数量关 “Schema learning ” is an important learning strategy in the process of mathematical learning. In the face of abstract mathematical situations, guide students to rely on line segments, situational map to start the process of self-learning - students to use schema as a carrier to build mathematical learning model to understand and solve mathematical problems, which is “. The implementation of ”schema teaching" is conducive to students to identify difficulties, complex as simple, abstract as concrete, familiar to students, to solve the difficulties in mathematics learning, to form their own knowledge system, the knowledge beaded into a line , Knot for the net. First, relying on the line segment modeling the number of customs