Abstract: The present paper dealt with the hereditary mechanism of white-feather in mule ducks.The result showed that the domestic ducks played a dominant function to produce white feather in mule ducks using the testing methods of reciprocal and rotation crossbreeding.The frequency of white feather from different genotype of female domestic ducks was variable,of which the domestic ducks with the meat-duck kin was higher than that with the egg-laying ducks.The more the meat-duck kin,the higher the frequency of white-feather in F1.A significant difference of white-feather also existed in the F1,of which the generation was characterized with high frequency of white-feather,among intraspecific individuals of the domestic duck.The pure selection from the individuals can be done to construct a special line for producing white-feather mule duck.