“探究功与速度变化的关系”实验是新课程高中物理一个新增的重要必修实验,也是近年高考的一个热点内容。在实际操作该实验时,存在着操作难度大、费时、成功率低、误差离奇等诸多问题。对此,可借助光电数字计时器,针对该实验存在的不足进行改进与创新,这样就能很好地解决该实验存在的种种问题。改进后的实验具有操作简便、成功率高、相对误差小的优点。 “Exploring the relationship between power and speed changes ” experiment is a new compulsory high school physics experiment new compulsory, but also a hot spot in recent years college entrance examination. In actual operation of the experiment, there are many problems such as difficulty in operation, time-consuming, low success rate, bizarre error and so on. In this regard, with the help of photoelectric digital timer, the shortcomings of the experiment for improvement and innovation, so that we can solve the problems of the experiment. The improved experiment has the advantages of simple operation, high success rate and small relative error.