新一轮课改要求我们倡导建构性学习,让学生建构一个融学科、生活、实践为一体的体系,同时还要改善学生的学习方式．在解题过程中,根据问题的条件、结论等特征,创造性地构造出与之相关的数学形式,联系已知与所求,从而使问题得以解决,即为“构造法”．本文介绍几种构造一元二次方程的方法． The new round of curriculum reform requires us to advocate constructive learning, allowing students to build a system that integrates discipline, life, and practice while also improving students’ learning style. In the process of solving the problem, according to the conditions of the problem, conclusions and other characteristics, creatively construct the relevant mathematical form, contact known and sought, so that the problem can be solved, that is, “construction method.” This article describes several ways to construct a quadratic equation.