OBJECTIVE：To provide reference for further clarifying the definition of counterfeit and inferior drugs and law enforcement for revelent departments ，and guaranteeing the safety of drug use and legitimate right for the public. METHODS ： Through comparative research ，literature research and interpretation of the new law ，comprehensive analysis and research was conducted for the relevant provisions of counterfeit and inferior drugs in the newly revised Drug Administration Law in respect of the definition ，penalty rules and identification basis of counterfeit and inferior drugs. The challenges and impacts of these changes on drug law enforcement were put forward from the perspective of drug law enforcement practice. RESULTS & CONCLUSIONS ： In terms of definition ，the newly revised Drug Administration Law redefined the counterfeit and inferior drugs ，which was reduced from 15 cases before the amendment to 11 kinds，but the content was more abundant. It cancelled the concept of punishing counterfeit and inferior drugs ；increased the prohibition of the use of counterfeit and inferior drugs ；punished violation behavior of drug administration order not according to counterfeit and inferior drugs ；removed two items that being punished as counterfeit drugs；adjusted the definition of contaminated drugs from counterfeit drugs to inferior drugs ；clarified the definition of excipients. In terms of penalty provisions ，the provisions of legal liability for counterfeit and inferior drugs in the newly revised Drug Administration Law comprehensively used a variety of punishment measures ，greatly increased the amount of fine ；differentiated the situation of production ，wholesale and retail of inferior drugs ，and set different punishment ranges ；appropriately reduced the punishment range of producing and selling TCM decoction pieces that did not meet the drug standards ；increased the punishment for the violation of drug management order ，and the scope of punishment was similar to that of counterfeit and inferior @qq.com drugs. The “double penalty system ”was implemented for serious illegal acts and punished to individuals. The punishment for drug users who used counterfeit and inferior drugs was clarified. The situation of heavier punishment for producing and selling counterfeit and inferior drugs was increased ，and the first responsibility system and punitive compensation were added to protect the legitimate rights and interests of consumers. In terms of identification basis ，the newly revised Drug Administration Law had deleted the provisions that specific situation of quality inspection conclusion may not be specified ，and only provided the principle provisions. The challenges and impacts of the newly revised Drug Administration Law on law enforcement included how to understand the “ingredients”in the definition of counterfeit drugs；how to distinguish between deteriorated drugs and contaminated drugs ；how to investigate and deal with unauthorized acts ； whether drug inspection reports were required in all cases of counterfeit and inferior drugs ；how to understand the situation that did not affect the safety and effectiveness ，and connecting administrative law enforcement with criminal justice for counterfeit and inferior drugs ，etc. It is suggested to further strengthen the law popularization ，and introduce the interpretation of the newly revised Drug Administration Law as soon as possible ，clarify the legislative intent ，and guide the grassroots law enforcement ；issue Amendment Ⅺ to the Criminal Law of the People ’s Republic of China as soon as possible ，increase the charges of illegal acts against the order of drug administration ，do a good job in connecting administrative law enforcement with criminal justice and crack down on the illegal and criminal acts in the field of drugs ，and further promote the administration according to law.