2. 1247 (the seventh year of China's Southern Song Dynasty, Li Zong), Song Ci (1 186-1249), who was then the army supervisor and ambassador to Hunan, compiled the Collection of Injustice, which was the first forensic work edited by the death system in the history of the world. The collection of unjust imprisonment begins with: "Nothing is greater than human life, and crime is greater than the death penalty. The murderer has no forgiveness before the law, and it is difficult to be safe if he is tortured improperly. So the designated prison depends on the casualty test. If the test is not true, the grievances of the deceased will be unresolved, and the grievances of the living will become again. If you kill two lives for one life, what is the end of revenge? " Therefore, the most important work of forensic doctors is to provide medical evidence, assist prosecutors and case handlers to find out the truth of judicial cases, restore the facts and protect the human rights of the dead and wounded. Compared with general medicine, ordinary doctors want to help patients, so forensic doctors want to help the dead. In order to provide the most objective and correct facts, forensic medicine must use the relevant knowledge of various disciplines to help handle cases.