In this study, it was carried out to improve the cow at the farm by estimating the genetic parameters of the carcass traits of Hanwoo cows. The average value and standard deviation of carcass weight(CW), eye muscle area(EMA), backfat thickness(BF), and marbling score(MS) were 343.73±46.51kg, 13.16±5.13mm, 82.67±11.30㎠, and 3.95±1.86 in the basic statistical analysis of cows. The environmental effect of variance analysis for estimating genetic parameters showed a significant difference(p<0.001) from each carcass traits for slaughter month age and HYS(breeding area, slaughter year, slaughter season. In the genetic parameters of carcass traits, the heritability(h2) of CW, EMA, BF, and MS were estimated to be 0.50, 0.40, 0.41, and 0.54, respectively. In the analysis of genetic correlation coefficients between carcass traits were 0.67, 0.15 and 0.06 in CW, EMA, BF, and MS, respectively. EMA and BF, MS are –0.11, 0.07, BF and MS were 0.13, and genetic correlation between CW and EMA showed a strong positive(+) relationship, but other traits showed a low correlation coefficient. In previous studies, it was known that there was a negative correlation between traits, but in this study, it was found that the marbling score was artificially adjusted by cartilage ossification when the CW was determined, and further research is needed. In the phenotypic correlation analysis, 0.65 and 0.37 and 0.27, respectively, in CW and EMA, BF and MS, EMA and BF, MS is 0.19, 0.26, BF and MS were 0.20, and the correlation coefficient was analyzed to be low between other traits except for the phenotypic correlation between CW and EMA. As such, there is high heritability in the carcass traits of cows with a distribution of 0.40 to 0.54, and various studies based on this should be promoted and used as an evaluation index to improve the fertility and meat quality of cows.