“导数与微分”已被列入高中数学教学大纲,将成为高考的热点之一.高中物理教学大纲中明确指出“应用数学处理物理问题的能力”是物理教学的一项重要内客,是高考能力考查的重要组成部分.为了体现数学学科的工具性和实用性,加强学科间的渗透,并由此强化对学生能力的考查.本文仅举几例说明导数在求物理极值问题中的应用. “Derivatives and Derivatives ” has been included in the high school math syllabus, will become one of the hot spots in the entrance exam.High school physics syllabus clearly states “The ability of applying mathematics to deal with physical problems ” is an important part of physics teaching In order to reflect the instrumental and practicability of mathematics disciplines and to strengthen interdisciplinary infiltration, and to strengthen the examination of students’ abilities, this paper gives a few examples to show that the derivation is seeking physical extreme value Application of the problem.