Objective To investigate the harm of drug abuse of drivers on traffic safety and discuss the countermeasures.Methods Data were collected from sources including statistics of drug driving traffic accidents reported by mass media,inference analysis of the theoretical data,survey of outpatients in drug rehabilitation center,drug-related screening with drivers license during Shanghai World Expo 2010 Moat Security and integrated data from various areas.ResultsOf the over 10 million drug abusers including the registered and unregistered in China,more than 2 million drug abusers had drivers license,which greatly threatened the traffic safety.Conclusion Drug abuse (drug driving) has done great harm on traffic safety,which calls for appropriate preventive countermeasures.