不等式恒成立条件下求参数的取值范围问题一直是高考命题中的一个热点问题。由于其涉及的知识面广,综合性强,同时数学语言抽象,具有形式灵活、思维性强、不同知识交汇等特点,是同学们学习的一个难点。本文通过实例对同学们一些常见的错误加以剖析,希望能在培养同学们思维的灵活性、创造性等方面起到积极的作用。 Inequality constants established under the conditions of the parameters of the range of values ​​has been a hot topic in the college entrance examination questions. Because it involves a wide range of knowledge, comprehensive, and mathematical language abstraction, with the form of flexible, thinking and strong, the intersection of different knowledge and so on, is a difficult point for students to learn. This article analyzes some common mistakes of students by examples, hoping to play an active role in cultivating students’ flexibility and creativity in thinking.