The　EDM　machine　is　special　processing　machine　using　the　principle　of　EDM　process　of　conductive　materials.　By　means　of　modal　analysis,　ODS　(Operational,　Deflection,　Shapes)　analysis　and　order　analysis,　the　static　and　dynamic　performance　parameters　of　the　EDM　machine　tool　are　studied.　According　to　the　processing　requirements,　the　structure　of　the　machine　tool　is　optimized,　and　the　weak　links　are　strengthened　so　as　to　reduce　the　aperture　dispersion　of　the　machined　holes.　Through　the　modal　test　this　experiment　firstly　analyzes　the　natural　frequency,　damping　ratio　and　modal　shape　in　each　mode　of　machine　tool　structure　to　understanding　the　characteristics　of　each　order　machine　main　mode.　Then,　through　ODS　(Operational　Deflection　Shapes)　test,　it　analyzes　the　vibration　characteristics　of　machine　tool　structure　in　operation　condition.　And　it　also　analyzes　the　relation-shape　between　the　vibration　of　rotating　machinery　and　the　speed　of　the　machine　through　the　order　analysis　to　predict　the　vibration　of　actual　machine　tool　structure　in　a　certain　band　external　or　internal　variety　of　vibration　response.　Finally,　it　makes　a　comprehensive　study　on　the　static　and　dynamic　performance　of　machine　tools,　and　provides　a　reference　for　the　design　and　optimization　of　structure　dynamic　strength.　©　Published　under　licence　by　IOP　Publishing　Ltd.