微小形变的演示实验是使学生理解坚硬物体受力形变的关键一环，高中物理课本中介绍的装置效果不明显，可见度太小。，笔者作了如下的改进，收到了较好的演示实验效果。1．器材及制作取一只中号烧瓶及一个能塞紧烧瓶的橡皮塞子，一枚医用针头；用针头反穿过橡皮塞子的中心轴线， The demonstration of small deformations is a key link for students to understand the deformation of hard objects. The effect of the devices introduced in high school physics textbooks is not obvious, and the visibility is too small. The author made the following improvements and received good demonstration experiments. 1. Equipment and production: Take a medium flask and a rubber plug that can jam the flask, a medical needle; use the needle to reverse the central axis of the rubber plug,