Rh-negative blood type is the panda blood type. Rh-negative blood type is very rare among Chinese people, just like the giant panda in China, less than 1% of Han Chinese people are Rh-negative blood type, the remaining 99% are Rh-positive blood type. In the ABO blood group classification system, there are A blood type, B blood type, O blood type and AB blood type, all four blood types are very common; in the Rh blood group classification system, there are only two blood types, Rh positive blood type and Rh negative blood type, and Rh negative blood type because it is rare in Chinese people. Rh-negative blood types are called panda blood types because they are rare among Chinese people.