Abstract: Zinc selenide polycrystalline ceramics were key raw materials for the development of high-performance optoelectronic devices. The corrosion method for metallographic examination of this ceramic material was studied. The surface of zinc selenide metallographic samples was corroded using methods such as 60 mL concentrated sulfuric acid+40 mL acetic acid, 20 mL HNO₃+10 mL HF+20 mL water, 5 g FeCl₃+50 mL concentrated hydrochloric acid+100 mL water, 95 mL concentrated hydrochloric acid+5 mL H₂O₂, and 100 mL concentrated hydrochloric acid steam corrosion. The results show that the surface of zinc selenide samples were corroded by 100 mL concentrated hydrochloric acid steam, and the obtained microstructure had clear grain boundary contours and clear grain morphology display, which was conducive to the analysis of microstructure uniformity and grain size evaluation of zinc selenide polycrystalline ceramic materials.