This work systematically expounds the basic theories and norms of criminal law, divided into four parts: introduction, crime, charges, and punishment. The introduction defines the concept of criminal law, distinguishes narrow and broad criminal law, and sorts out the development of criminal law at home and abroad. The first part, "Crime", analyzes the definition and establishment elements of crime, covering subjects, objects, legal principles, body movements, responsibilities, illegal acts, and explains in detail key concepts such as intention, negligence, and legitimate defense. Part II, "Crime", classifies crime types, such as felonies and misdemeanors, summary crimes and continuing crimes, etc., And explains the behavioral classes (expression of criminal intent, preparation, commencement, execution) and the identification and punishment of repeated crimes, joint crimes, and accomplices. Part Three "Penalty" defines the concept of punishment, introduces life punishment, freedom punishment, property punishment, ability punishment and other types, explains the applicable rules of punishment (aggravation, mitigation), execution methods and elimination situations (such as death of the prisoner, pardon, statute of limitations, etc.), And builds a complete system of general principles of criminal law.