The current age requirement for donors is 18-55 years old, and can be relaxed to 60 years old if the donor’s physical condition permits. Men should weigh no less than 50kg and women no less than 45kg, and they should have been discharged from the hospital for more than 2 weeks, be in good health and have no unwell symptoms. In addition, rehabilitated persons need to be free of underlying diseases such as hypertension, hyperlipidemia and diabetes, and free of infectious diseases such as hepatitis and AIDS. At present, the recovered person takes single plasma collection, which only collects plasma, blood cells, etc., and all other components are also transfused to the donor himself, which is relatively safe and has less impact on the donor’s body.