Introduction: The "People's Police Law" is a "basic law" in the people's police legal system. To ensure its implementation, the support of relevant laws, regulations and systems is an important condition. Therefore, after the promulgation of the "People's Police Law", the state issued a series of supporting regulations to implement the relevant provisions of the "People's Police Law". In order to help readers accurately understand and apply the "People's Police Law", this book annotates the key legal provisions and professional terms in the "People's Police Law", refines difficult issues based on judicial practice, and includes supporting regulations related to the implementation of the "People's Police Law", including regulations related to the exercise of powers by the people's police, such as the "Regulations on the Application of Continuing Interrogation by Public Security Organs", the "Regulations on the Management of Official Use of Guns by Public Security Organs", as well as regulations related to the quality of law enforcement by the people's police.