为了解决激光多普勒效应在实验室演示比较困难问题 ,介绍了一种采用双光栅法实现激光多普勒效应的实验仪器 ,分析了双光栅法多普勒效应原理 ,给出了该仪器的组成结构 ,并分析了该仪器的特点。实验表明 :采用双光栅法实现激光多普勒效应操作简单、效果明显。 In order to solve the problem that the laser Doppler effect is difficult to be demonstrated in the laboratory, an experimental apparatus for realizing laser Doppler effect by using double grating method is introduced. The Doppler effect principle of double grating method is analyzed. Composition of the structure, and analysis of the characteristics of the instrument. Experiments show that: the use of double grating method to achieve the laser Doppler effect is simple, the effect is obvious.