Repeatabilities of birth and weaning weights of Korean Native Cattle were estimated based on the data from 240 calves raised at the Whasan Branch of the Livestock Experiment Station from 1957 through 1968. The birth weight was adjusted for differences in age of dam, year-season of birth, and sex. The weaning weight was adjusted for differences in age of dam, year-season of birth, sex, inbreeding of calf, and inbreeding of dam. Repeatabilities estimated were 0.23±0.07 for birth weight and 0.23±0.07 for weaning weight at 5 months of age. Phenotypic correlation between the two traits was 0.33±0.07.