Legal analysis: first, the right of defense. Second, the types and ways of defense. Third, defenders and the scope of defenders. Fourth, the litigation rights and obligations of defenders. Fifth, the responsibility of the defender. Defenders shall bear the responsibility of providing materials and opinions to prove the innocence and light crimes of criminal suspects and defendants or to reduce or exempt their criminal responsibilities according to facts and laws, and safeguard the legitimate rights and interests of criminal suspects and defendants.

Legal basis: Article 278 of the Supreme People's Court's Interpretation of Applicability refers to the defendant's confession. After confirming that the defendant knows the criminal facts and charges charged in the indictment, he voluntarily pleads guilty and knows the legal consequences of pleading guilty, the court investigation can mainly focus on controversial issues such as sentencing.

In a case where the defendant does not plead guilty or the defender does not plead guilty, the court investigation shall find out the relevant sentencing facts on the basis of finding out the conviction facts.