Inheritance of plant height was studied in the two dwarfing genedonors, Zhepi 1 and Aizao 3, in barley breeding in China. Sing irect cross and para-back-cross methods, allelic tests were carried out not only between the dwarfing genes in Zhepi 1 and izao , but also with br, uzu, denso, or sdw1 and the six novel dwarfing genes that have been recently identified in barley in China. He results showed that the plant height was attributed to Mendelian inheritance of a recessive dwarfing gene both in Zhepi 1 nd izao 3. The dwarfing genes carried by the two cultivars were the same, but different from the three known and the six novel warfing genes. On the basis of the present study, only two dwarfing genes have been used in barley breeding in China since 1950.