《数学新课程标准》明确提出:“有效的数学学习活动不能单纯地依赖模仿与记忆,动手实践、自主探究与合作交流是学生学习数学的重要方式”。这就把合作交流提到了一个新的高度,小组合作是否成功有效,是数学课堂教学改革是否成功的重要标准之一,合作教学也是建构主义教学观在数学教学环节设计中的具体体现。自2008年学校开始实施“3461”新课堂教学模式以来,已经有五年的时间了,我作为学校教改的亲历者,经过长期观察以及自己 The New Curriculum Standard of Mathematics states clearly: “Effective mathematics learning activities can not rely solely on imitation and memory, hands-on practice, self-exploration and cooperation and exchange is an important way for students to learn mathematics.” This put the cooperation and exchange mentioned a new height, the group cooperation is successful and effective, is one of the important criteria for the success of mathematics classroom teaching reform, and cooperative teaching is also a concrete manifestation of constructivism teaching concept in the design of mathematics teaching. It has been five years since the school began implementing the “3461” new classroom teaching model in 2008. After a long period of observation and myself