most antigens from the blood group Rh are weak and do not really elict antibody production.The exception is the D antigen ,which is strong and is likely to cause transfuction problem. Thus, the classification of being Rh+ or Rh - is dependent on the presence of this particular antigen.On the Rhesus factor ,this study further confirm that Rh + has the hight percentage frequency while Rh - has the low percentage frequency in a the three ethnic group as observed in previous study among different ethinc group.