Aiming　at　the　problem　of　poor　processing　performance　and　difficult　processing　in　the　process　of　aluminum-based　diamond　composites　for　electronic　packaging,　this　paper　uses　electrolytic　in-process　dressing　(ELID)　grinding　technology　to　grind　the　aluminum-based　diamond　composites.　The　quadratic　orthogonal　rotation　combination　method　was　used　to　investigate　the　influence　law　and　degree　of　grinding　depth,　grinding　wheel　linear　velocity,　duty　cycle　and　electrolysis　current　on　surface　roughness.　The　ELID　grinding　optimization　process　parameters　of　aluminum-based　diamond　composites　obtained　by　LINGO　software　are:　grinding　depth　9.3　mu　m,　grinding　wheel　linear　speed　36　m/s,　duty　cycle　63.7%,　electrolysis　current　11.5A.　The　surface　of　the　aluminum-based　diamond　composite　with　a　surface　roughness　of　125　nm　was　machined　by　this　optimized　process　parameter　combination.