Criminal psychology is a discipline that studies criminal behavior, motivation, psychological characteristics, and the prevention and handling of crimes. The following are some of the main contents of criminal psychology: Criminal Psychologists study the criminal's personality traits such as creativity, curiosity, emotional stability, self-awareness, social skills, etc. to understand the criminal's behavior patterns and thinking patterns. Criminal Psychologists study the motives of criminals such as personal gain, power, wealth, revenge, etc. to help the police prevent and combat crime. 3. The time and place of the crime: Criminal Psychologists analyze the relevant information of the time and place of the crime, such as climate, weather, time, location, crowd, etc., to help the police investigate and predict the crime. 4. Criminal psychological defense mechanisms: Criminal psychologists study the criminal's psychological defense mechanisms such as repression, escape, transfer, projection, etc. to understand the criminal's mental health and the way they deal with stress. Criminal psychology models: Criminal psychologists study various criminal psychology models such as criminal behavior, psychological portraits, criminal personality, etc. to help the police understand the characteristics and behavior patterns of criminals. 6. Crime prevention and treatment: Criminal psychologist studies crime prevention and treatment methods such as crime prevention, law enforcement mechanisms, and psychotherapy to help the police and society prevent crime and maintain social stability. Criminal psychology was a comprehensive subject that required the combination of knowledge from many disciplines such as psychology, psychology, law, and medicine to explore the nature of crime and effective methods to prevent crime.