Abstract: The Experiment of measuring Young＇s modulus is one of the most important experiments in the course of experiments of university physics. With the guidance of teachers and longtime experimenting, the optical lever-a key component of the instrument of the experiment of measuring young＇s modulus-is improved, which thoroughly eliminates the hidden trouble that the optical lever is easy to drop and break.

Key words: instrument of measuring Young＇s modulus, optical lever