Conduct disorder refers to a type of behavioral disorder in which children and adolescents under the age of 18 repeatedly and persistently violate social norms and moral standards appropriate to their age, and infringe on the interests of others or the public. These abnormal behaviors are usually called so-called antisocial behaviors in foreign countries and China, and are mainly manifested in childhood lying, truancy, fighting, vandalism, attacking others, stealing, fraud and other conduct problems. Conduct disorder has the following characteristics: ① repeated and continuous occurrence; ② the severity and duration exceed the range of variation allowed by children; ③ difficulty in adapting to the social environment; ④ not caused by physical or mental illness; ⑤ closely related to family education and social environment. It can be divided into two subtypes: antisocial conduct disorder and oppositional defiant disorder.