《基础教育课程改革纲要》指出:教师在教学过程中应与学生互动、共同发展.教师应尊重学生的主体地位,创设能引导学生主动参与的教学情境.好的开始是成功的一半,创设合理的情境作为一节课的引入,既激发了学生的兴趣,又能帮助学生理解数学本质.南京大学郑毓信教授认为情境创设的一个重要 The Essentials of Curriculum Reform in Elementary Education states that teachers should interact with students and develop together in the process of teaching.Teachers should respect students’ main body position and create teaching situations that can lead students to take the initiative to participate.Has a good start is halfway to success, As the introduction of a class, not only stimulate the interest of students, but also help students understand the nature of mathematics.Jiangsu University, Professor Zheng Yuxin that situational creation is an important