With regard to the difference between corpse spot and blood spot or subcutaneous hemorrhage, Chinese classical forensic medicine has accumulated rich experience. This point has been discussed in the Record of Remembering Injustice for a long time, and there is an accurate identification method. It is recorded in the "Autopsy" section of the Record of Complaints: "You must use your fingers to examine injuries. If you press green and red, it means that the injury is hard. If it means that green and red are still together, it means that it is a real injury. If it is a change, it will point to a point, and the first finger is white. ..... hair change is the blood in human abdomen, which spreads after death and cannot be aggregated, so it is floating. The injury was beaten before death, and the blood gathered into injuries. " "Every dead person, behind his neck, back, ribs, arms and legs, ... his feet are red up and down, which is caused by his bleeding on his back, not other reasons." It is recorded in the section "Hanging": "After hanging, the blood is not good, and the body is purple and black, such as cloud condensation, and there is a change called blood barrier. There are bruises and edema, and the blood barrier is more or less. " Here, "hair change", "blood drop" and "blood barrier" all refer to corpse spots.