[Objective] The aim was to investigate the distribution of the halothane （Haln） gene in breeding pig group in Beijing area.[Method] PCR-RFLP method was used to determine Haln genotype of 609 breeding pigs from boar stations and pig breeding farms in Beijing.[Result] The Haln gene frequencies of Large White,Landrace,Duroc and Pietrain pigs of the boar stations were 0,17.11%,5.56% and 18.75%,respectively; and the Haln gene frequencies of Large White,Landrace and Duroc pigs of pig breeding farms were 4.52%,11.68% and 23.33%,respectively.[Conclusion] The result provided a basis for the rational use of Haln gene.
