Abstract: After the brief introduction of the structure and principle of Fabry-Pérot interferometer,Matlab is used to simulate the interference patterns. Simulation is mainly focused on the effect of reflectivity,spacer layer thickness,refractive index,the beam incident angle and wavelength on the interference patterns. Finally,the two concepts of free spectral range and fine degree are vividly explained by the Matlab simulation. This work will help readers to better understand the principle and function of Fabry-Pérot interferometer in Zeeman effect experiment.

Key words: Fabry-Pérot interferometer, Zeeman effect, Matlab simulation