Based on the social harmfulness of negligent dangerous act and the protective function of criminal law,legislation of negligent dangerous crime has appeared in China's criminal law,but negligent dangerous crime still needs to be further developed at the normative level.In the normative construction of negligent dangerous crime,we should follow the principles of modesty,proportionality and system coordination of criminal law.In the construction of crime,we should pay attention to the protection of legal interests limited to major public safety,the coexistence of behavior risk and behavior object risk,the limitation of attention ability and duty,the coexistence of illegal intent and consequential negligence,and should pay attention to the mitigation of legal punishment.