In recent years, foreign research and development of precision grinding and precision grinding technology to get a lot of results and progress. Professor Omori entire country of Japan RIKEN successfully developed online wheel dressing ELID Grinding of new technology, it can be flat on a variety of different materials (such as steel, carbide, ceramics, optical glass, silicon, etc.) of parts, outer and inner holes mirror grinding. ELID Grinding using a special fine-grained iron-based binder diamond (or CBN) grinding wheel, the grinding wheel to be online when the electrolytic dressing, the electrolyte used in electrolytic dressing grinding wheel as both grinding fluid (electrolyte such requirements non-corrosive machine). With the new technology of ELID grind different specimens (flat optical glass, silicon and ceramics plane bore) of the grinding surface roughness may reach the level of the mirror (Ra = 0.02 ~ 0.01μm). ELID precision mirror grinding process with excellent production prospects. Now China Harbin Institute of Technology has studied and mastered the new precision grinding process.