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.　The　reason　of　vibration　aggravation　of　the　high-speed　electric　spindle　at　high-speed　working　status　is　studied.　Other　reasons　of　abnormal　vibration　are　identified　on　the　high-speed　electric　spindle　and　machine　tool　structure,　including　their　design,　manufacture,　component　defects,　etc.　The　experimental　results　show　that　the　vibration　order　analysis　combined　with　the　experimental　modal　test　is　an　effective　measure　and　analysis　method　for　the　abnormities　diagnosis　of　CNC　machining　center.