Abstract: Objective: systemically analysis the features of the pre-hospital sudden deathevents（SDE）, especially the features of cardiac sudden death, for further elucidating the regularities of the SDEs, and for further decreasing the mortality of SDEs. Methods: totally 1030 pre hospital emergent cases be collected from 1973～1999, were analyses systemically. Results: the total SDEs are 106 cases; the cases who had basic cardiovascular diseases are 68,in which there are 89.6% have coronary heart diseases（CHD） AMI or OMI with re infarction. It should be highly noticed that, there are two peak SDEs age stages: the first is 46-55 year old stage（non, retaired age stage,ratio:22.6%）, and the second stage is 66. 75 years old（ratio:27.3%） Conclusion: The pre-hospital SDEs, now is one of the most needed to be treated emergent cases. For those had the history of cardiovascular diseases, it should be highly noticed that the high possibility of sudden death, especially those have basic coronary cardiac events