The RH positive blood type is a comprehensive expression of a person’s blood type, because there are dozens of human blood types, but there are only two clinically significant and widely used in clinical practice, one is the ABO blood group system, and the other is the RH blood group system. the ABO blood group system divides human blood types into four types, namely, A blood type, B blood type, O blood type and AB blood type. the RH blood group system was first The RH blood group system was first discovered on the red blood cell membranes of Indian rhesus monkeys, and according to whether there is still D antigen on the red blood cell membranes, the RH selection system is divided into two categories: those with D antigen are RH-positive, and those without D antigen are RH-negative, and D antigen has very strong antigenicity. an RH-negative person who comes into contact with RH-positive blood will have a strong antigenic antibody reaction. o blood group RH-positive means that a person’s blood type is O blood in the ABO blood group system and RH positive blood in the RH blood group system.