1. In a criminal trial, a lawyer may be refused to defend, or other defenders may be entrusted to defend. However, due to economic difficulties or other reasons, he did not entrust a defender to apply to a legal aid institution; A mental patient who is blind, deaf, dumb or has not completely lost the ability to identify or control his own behavior has not entrusted a defender; He may be sentenced to life imprisonment or death penalty, and if he has not entrusted a defender, he must have a defender to defend him. 2. Legal basis Article 45 of the Criminal Procedure Law of People's Republic of China (PRC) In the trial, the defendant may refuse the defender to continue to defend him, or entrust another defender to defend him. Article 35 If a criminal suspect or defendant fails to appoint a defender due to financial difficulties or other reasons, he or his near relatives may apply to a legal aid institution. To meet the conditions of legal aid, legal aid institutions shall appoint lawyers to defend them. If the criminal suspect or defendant is a mental patient who is blind, deaf, dumb or has not completely lost the ability to identify or control his own behavior, and has not entrusted a defender, the people's court, the people's procuratorate and the public security organ shall notify the legal aid institution to appoint a lawyer to defend him. If a criminal suspect or defendant may be sentenced to life imprisonment or death without entrusting a defender, the people's court, the people's procuratorate and the public security organ shall notify the legal aid institution to appoint a lawyer to defend him.