The　high-speed　electric　spindle　is　the　key　part　of　the　machining　center　which　performing　high　speed　precision　machining.　In　order　to　ensure　the　electric　spindle　running　under　the　smooth　and　steady　state,　it　is　necessary　to　prevent　and　discover　the　abnormities　during　the　running　process　of　the　electric　spindle　by　the　experimental　test　and　analysis.　In　this　paper,　the　vibration　order　analysis　method　combined　with　the　experimental　modal　test　is　utilized　to　measure　and　diagnose　the　abnormities　of　a　high　speed　electric　spindle.