本文介绍了自主设计与制造的金属线胀系数测量实验装置的构造、原理以及特点，以此为基础开展测量金属线胀系数的实验. 该仪器采用便携式设计，物理杠杆与光杠杆相结合，水循环加热，使得待测金属杆受热均匀. 本文主要对铝、铜、铁三种常见的材料进行了测量，实验误差均在3%以内. 该仪器的设计与制作主要是用于教学演示，能够帮助学生学习和理解线胀系数、光杠杆、水循环加热等方面的知识，为测量金属线胀系数的实验提供了良好的实验器材.

The structure, principle and characteristics of a selfdesigned and manufactured experimental device for measuring metal linear expansion coefficient are introduced. On this basis, the experiment for measuring metal linear expansion coefficient is carried out. The instrument adopts portable design, the combination of physical lever and optical lever, water circulation heating, so that the metal rod to be measured is heated evenly. Three common materials, aluminum, copper and iron are measured and the experimental error was less than 3%. The design and manufacture of the instrument are mainly used for teaching demonstration, which can help students learn and understand the knowledge of linear expansion coefficient, optical lever and water circulation heating. It provides a good experimental equipment for the experiment of measuring metal linear expansion coefficient.