As an important part of the judicial system, the trial level system plays a vital role in the operation of the whole judicial system.

For a long time, China's criminal trial level system has always adhered to the single system of two trials and final adjudication. With the rapid development of China's social life, the unreasonable design and irregular operation of China's criminal trial level system have caused many problems in practice, and the system of final adjudication by two trials has exposed more and more defects in practice. Therefore, it is necessary to reflect on China's criminal trial level system in theory, and learn from the mature experience of other countries to improve it, and finally establish a selective system of third instance and final instance.

For a long time, China's criminal trial level system has always adhered to a single trial level system in China's social life. With the rapid development of China's criminal trial level system, its unreasonable design and irregular actual operation have caused many problems in practice, and the trial level system has exposed defects in practice. Therefore, it is increasingly necessary to rethink China's criminal trial level system in theory and learn from the experience of other countries to make it perfect and mature, and finally establish the choice of the three-trial system.