The defendant's right to defense is a common litigation principle in all countries of the world.

The defendant's right to be defended is a universal litigation principle in all countries of the world, which is clearly stipulated in our Constitution and Criminal Procedure Law. The defense system is an important content to realize the protection of human rights in litigation. Defending and refuting the position of the investigation and control organs in applying punishment is one of the three functions that modern criminal proceedings depend on for survival and development, and it is also the most basic and key litigation right enjoyed by criminal defendants. Criminal agency refers to the legal system in which the agent accepts the entrustment of the victim of an appeal case and his legal representative or near relative, the private prosecutor and his legal representative of a private prosecution case, the parties involved in an incidental civil action and his legal representative to participate in the litigation and conduct activities in the name of the agent, and the agent also bears the legal consequences of an agency act. Although defense and agency in criminal proceedings have something in common, as two basic systems, they have many differences.