Psychiatry has always a dual role, application of professional knowledge to assist the judiciary to decide appropriate disposal, and based on the premise of protection and treatment, to provide expert opinions. Criminal responsibility and civil custody have become routine evaluations of forensic psychiatry. However, civil issues, such as medical decision-making and the ability to various decisions and judgments, have ample space for development. The problem of “correctability” in the death penalty is controversial, but in deciding those newly obscure facts, the courts will continue to seek the opinions of psychiatry or psychology. The criminal justice system will continue to head in “therapeutic justice” direction while managing drunk driving and drug crime. The psychiatrists with specialized knowledge and experience will continue to play an indispensable part of the criminal justice system.