In order to study the serological characteristics and genetic background of Bel subtypes, A, B and H antigens on the surface of red blood cells of the proband as well as his family and the anti-A, anti-B antibodies in their serum samples were detected by hemagglutination test; the A, B, H substances in saliva were determined by inhibitory agglutination test. The results indicated that the proband, his mother and his daughter all were identified to be Bel phenotype; his two sisters were identified to be ABel phenotype; his father, son and spouse were identified to be A, B and B phenotype respectively. It is concluded that the Bel subtype exists as family genetic characteristics in China.