布鲁姆在《教学目标分类学》中指出“有效的学习始于准确地知道要达到的目标是什么,目标必须清楚、具体、可操作,”清晰的教学目标是教学的关键,是处理教材和选择教法的依据,也是评价课堂教学效果的标准,“课标”是确定数学教学目标的依据,是对中学生数学素养的基本要求,但依据课标确定的教学目标属于上位目标,和实际的课堂教学还有一定的距离, Broome pointed out in Teaching Taxonomy of Taxonomy that effective learning begins with exactly knowing what the goal is to achieve, and the goal must be clear, specific and actionable. Clear teaching objectives are the key to teaching The basis of teaching materials and choice of teaching method is also the standard to evaluate the effect of classroom teaching. “Course standard ” is the basis for determining the goal of mathematics teaching and is the basic requirement of secondary school students ’mathematics accomplishment. However, the teaching objective determined by the course standard belongs to the upper level Goal, and the actual classroom teaching there is a certain distance,