Legal basis: A written statement was signed in Article 31 of the Guiding Opinions on Applying the System of Pleading Guilty and Accepting Punishment with Leniency. If a criminal suspect voluntarily pleads guilty and agrees to apply sentencing suggestions and procedures, he shall sign a confession and repentance in the presence of a defender or a lawyer on duty. Where a criminal suspect is detained, the detention center shall provide a place to sign a written statement. The written statement shall include the criminal suspect's truthful confession of the crime, the suggestion of agreeing to sentencing, the application of procedures, etc. And signed by the criminal suspect, defender or lawyer on duty. If a criminal suspect pleads guilty and admits punishment, it is not necessary to sign a statement of pleading guilty and admitting punishment in any of the following circumstances: (1) The criminal suspect is a mental patient who is blind, deaf, dumb or has not completely lost the ability to identify or control his own behavior; (two) the legal representative or defender of the juvenile criminal suspect has any objection to the juvenile's confession and punishment; (3) Other circumstances in which it is not necessary to sign a confession and repentance. Under the above circumstances, if the criminal suspect fails to sign the confession statement, it will not affect the application of the leniency system.