This experiment adopts a Mach-Zehnder interferometric optical path to conduct the holographic grating preparation experiment. By utilizing the adjustable angle between the two beams in the interferometric optical path and the multiple recording capability of holography, the fabrication of two-dimensional holographic gratings with different grating constants was achieved. In traditional holography and holographic grating fabrication teaching experiments, appropriately expanding the content through simple methods can not only enrich the teaching experiment content and enhance students' interest, but also help broaden students' professional knowledge and familiarize them with research topics in related fields. Note: This teaching system is shipped as components. Users can operate it according to the experimental manual content.