There are three methods of blood group identification, as follows: 1, slide method: that is, a slide above the patient’s red blood cells, drops of the corresponding detection reagents, one is anti-A reagent, another anti-B reagent, by manually shaking well, the person being tested if the type A, can quickly with the anti-A antibody will agglutinate, the naked eye can see the red blood cells produce clots, if not very clear, can be seen directly under the microscope Red blood cell agglutination; 2, test tube centrifugation method: the same test material, the red blood cells being tested by adding anti-A or anti-B reagents, through a special blood type identification centrifuge well after centrifugation, the bottom of the test tube if the clot deposited, can be shaken again after observation, shaking does not disperse that agglutination. If and anti-A agglutination is A type, with anti-B agglutination is B type, not agglutination is O type, if all agglutination is AB type; 3, micro-column gel method: can be operated on fully automatic instruments, with gel media instead of environment, automatically add serum or red blood cells. Now fully automatic blood group identification analyzer is used more frequently in major hospitals, because the process is convenient and the accuracy is very high and easy to operate.