Legal analysis: Criminal defense is generally divided into justifiable defense, entrusted defense and appointed defense. The so-called self-defense is the self-defense of the criminal suspect and the defendant. This kind of defense runs through the whole process of criminal proceedings. No matter in the investigation stage or the trial stage, the defendant can defend himself. Self-defense is a very effective and frequently used defense method. Entrusted defense means that a criminal suspect or defendant signs an entrusted contract with a person permitted by law, and others defend themselves. Other people here can be lawyers or other citizens. Compared with self-defense, entrusted defense is more conducive to the full exercise of the right of defense by criminal suspects and defendants, thus becoming the most important defense method in modern criminal proceedings. Designated defense means that under certain circumstances stipulated by law, the court appoints a defense lawyer to defend the defendant who has not entrusted a defender.
Legal basis: Article 2 of the Criminal Procedure Law The tasks of the Criminal Procedure Law of People's Republic of China (PRC) are: to accurately and timely identify criminal facts, correctly apply laws, punish criminals, protect innocent people from criminal investigation, educate citizens to consciously abide by the law, actively fight against criminal acts, safeguard the socialist legal system, respect and protect human rights, protect citizens' personal rights, property rights, democratic rights and other rights, and protect socialist construction.