Legal basis: Article 174th of the Criminal Procedure Law of People's Republic of China (PRC). 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. Generally, confession and punishment are put forward by lawyers. In the lenient system of pleading guilty, the effective defense of lawyers can ensure the voluntariness of the defendant's confession and strive for the defendant's best interests. But at this stage, the effective participation of lawyers is not sufficient. The reasons include unclear lawyer's role, imperfect system environment, difficult lawyer's defense and increased agency risk. In the future development, it is necessary to introduce strict rules to implement lawyers' participation and require lawyers to improve their coping ability.