Abstract:The conventional wisdom is that negligent crime can’t to be a joint crime. But with the development of the industrial age , there are more and more negligent crimes committed by many persons . So ,many scholars think that a negligent crime can to be a joint crime .but the argument about what is a joint negligent crime is very intense .Someone ever confuse the concepts of the simultaneous crime . competing negligent crime and joint negligent crime. We must distinguish those concepts, and to define what is the meanings of negligent joint crime