Abstract: The traditional optical level of Young＇s modulus measuring instrument path light adjustment is very complex,but can be improved by laser replace the telescope and obtain a measurement on the gauge more convenient. At the same time,according to the spiral micrometer,we can word out it＇s magnification times,thus confirming the metal ware＇s small elongation. Comparing with the traditional measuring method of young＇s modulus,this method is not only convenient adjustment,but also intuitive and high accuracy.

Key words: Young＇s modulus, optical lever, small elongation, laser