IntroductionCervical spine mjury(CSI) occurs 2％ in all blunttrauma,8-10％in patient with GCS(Glasgow comascore)<8.The causes for CSI are momr vehicleaccident(MVA，40-50％)，fall(20％)，sports andrecreation(7-15％)，gunshot(2-5％)，iatrogenic(surgeDr，<2％)．The incidence of spinal cord injuryisabout 2 per 100，000 each year in US，half the injuryinvolves cervical spine，and most are males(850％)．Prevention ofCSIincludes：1)automaticprotectiondevices-airbags；2)laws-seat belt，helmet，enforcedalcohol and drug testing；3)identifying high riskactivities-diving，ice hockey，etc；4)avoidance ofmedical causes such as aorta cross clamping，breechpresentations，or spinal surgery；5)education on risktakingbehaviors．