“Youth is strong and the country is strong”. The minors shoulder the hope of the country and concern the country’s future and tomorrow. The healthy growth of minors is closely related to their own development, family harmony, and even the rise and fall of the country and society. However, juveniles have poor ability to identify and control, and some minors do not receive good family and school education. They are vulnerable to social bad habits, and they easily embark on the road of illegal crimes. At this time, they face criminal prosecution and face public powers of the state. On the one hand, they are prone to develop resistance and do not give correct guidance and help. They will seek more extreme measures to retaliate against the society; on the other hand, they are physically and mentally fragile and lack relevant The legal knowledge and social experience is a weak side in the process of criminal proceedings. The prevention of juvenile delinquency is of course very important. However, when juveniles commit crimes, they are subjectively malign and their ability to perceive and express cannot be compared with that of adults. Therefore, post-factual assistance and remedial measures are also essential. In order to enable the minors to grow up smoothly, return to society, and in order to maintain and protect the legal rights and interests of minors, it is absolutely necessary to construct and improve a criminal legal aid system for juveniles.