On　the　basis　of　the　grinding　principles　and　grinding　characteristics　of　the　composite　material,　considering　the　characteristic　of　electrolytic　dressing,　the　effect　of　activation　and　passivation　and　machining　mechanisms　of　grinding　fluid　in　ELID　grinding,　the　study　on　ELID　special　grinding　fluid　for　composite　material　has　been　carried　out　based　on　the　general　ELID　grinding　fluid　by　large　numbers　of　assaying.　The　special　ELID　grinding　fluid　had　been　developed　fit　for　the　grinding　characteristic　of　composite　material.　The　experiment　of　ELID　precision　mirror　surface　to　the　representative　material　steel-bonded　carbide　had　been　conducted.