Contraindications to autologous blood transfusion are as follows: 1. blood has been contaminated by gastrointestinal contents, digestive fluid or urine; 2. blood may be mixed with tumor cells; 3. patients with hepatic or renal insufficiency; 4. patients with severe anemia, it is not advisable to collect blood or do autologous blood transfusion by hemodilution method before surgery; 5. patients with sepsis or bacteraemia; 6. open thoracic and abdominal cavity injury for more than four hours or blood remains in the body cavity for too long The person who has been in the body cavity for too long. Autologous blood transfusion, also known as self transfusion, is a clinical process of recovering, filtering and retransfusing the bleeding in the body cavity back to the patient after the occurrence of thoracic or abdominal bleeding. Autologous transfusion can reduce blood waste while avoiding blood-borne diseases.