Song Ci is an upright official, with keen ears and clear eyes. It is believed that being in power mainly depends on being an official. "Bad officials have laws, but no rules.". He is careful about prison affairs, attaches importance to on-site inspection, advocates obtaining case evidence through inspection, finds out the truth of the case, and emphasizes that judicial trials do not trust confessions.

He summarized the experience of forensic medicine in Song Dynasty and before, as well as his inspection experience during his four terms as a judge. In the seventh year of Chunyou (1247), he wrote five volumes of Injustice Collection, which recorded the examination of injury, autopsy, blood type identification, bone examination, casualty identification, poison identification, first aid methods, prescription for taking poison, etc. This is the first one in China.

The achievements of song ci.

The guiding ideology of the compilation of Yi Yuan Ji by Song Ci is "close the prison carefully, direct the punishment". "Cautious imprisonment" inherits the mainstream legal thought of Confucianism (Neo-Confucianism) and "cautious imprisonment". As a follower of Zhu Cheng's Neo-Confucianism, Song Ci clearly stated in his book Preface to Injustice Collection: "Prison affairs are not more important than opening up, opening up is not more important than first love, and first love is not more important than investigation. Cover the right to enter and leave life and death, and waste the opportunity to bend and stretch, so I will decide. "

Song Ci believes that only through strict inspection can the justice of the judgment be guaranteed. At the same time, Song Ci also clearly realized that the key to caring for punishment and being cautious in prison lies in the professional ethics of law enforcers. Therefore, in the book Injustice Collection, Song Ci not only recorded the relevant laws, inspection systems and penalties for inspectors' dereliction of duty in the Song Dynasty, but also put forward matters needing attention in forensic examination according to their own practical experience.

Reference to the above content: Baidu Encyclopedia-Song Ci