“第一印象”是心理学所着重研究的重要领域,鲜明地影响着观察者的观念和评价.而“导入”正如高中数学教学过程给予学生的“第一印象”塑造,深刻地影响着高中生对既定数学课堂教学的态度和行为.因此,笔者将着重探讨高中数学如何营设一个良好的导入环节,具体从精简、纯正、活泼以及多样四个原则进行了述说. “First impression ” is an important area of ​​psychology research, which clearly affects the observer’s concept and evaluation. “Import ” just as the high school mathematics teaching process to give students “first impression ” shape , Which profoundly affects the attitude and behavior of senior high school students to the established mathematics classroom teaching.Therefore, the author will focus on how to set up a good introduction link in senior middle school mathematics, specifically speaking from the four principles of streamlining, pure, lively and diverse.