Rh-positive means Rh-positive blood group, which is a type of human blood group system and is widely used in clinical practice, and is named according to the presence or absence of D antigen on the red blood cell membrane. If the red blood cell membrane contains D antigen, it is Rh positive, if the D antigen is not on the red blood cell membrane, it is Rh negative, in our country Rh positive people account for the majority of people, Rh negative people are very few, but Rh negative has a very important significance for clinical transfusion and obstetrics, for example, a Rh negative woman, if she has had a blood transfusion or abortion before giving birth to a child, when giving birth to a child, it is likely to Neonatal hemolysis caused by Rh blood group incompatibility will occur, causing significant effects on the fetus or newborn. Therefore, Rh blood group has a very important significance in clinical transfusion and obstetrics.