legal ground
Article 78 of the criminal law
Conditions and limits of commutation A criminal sentenced to public surveillance, criminal detention, fixed-term imprisonment or life imprisonment may have his sentence reduced if he consciously abides by prison regulations, accepts education and reform during the execution period, and truly shows repentance or meritorious service; One of the following major meritorious deeds shall be commuted:
(a) to prevent others from engaging in major criminal activities;
(2) reporting major criminal activities inside and outside the prison, which is verified by investigation;
(three) there are inventions or major technological innovations;
(4) sacrificing oneself to save others in daily production and life;
(five) outstanding performance in resisting natural disasters or eliminating major accidents;
(6) Having made other significant contributions to the country and society.