分析了混气电火花精微光整加工的机理，介绍了混气加工装置，并进行了对比加工实验．结果表明混气电火花加工能够有效地改善加工表面粗糙度和提高生产率． The mechanism of micro-finishing of mixed-gas spark was analyzed. The mixed gas processing equipment was introduced and the comparison experiment was carried out. The results show that mixed-air EDM can effectively improve the machined surface roughness and improve the productivity.