The effects of breed, sex, parity, farrowing year, and farrowing month on the major economic traits were investigated on 6,948 pigs of three breeds, Duroc, Landrace and Large White. Overall average daily gain at the age up to reaching 90㎏ of body weight was 829±1.30g. And overall mean age, backfat thickness, body length and height at 90㎏ of body weight were 154±0.14 days, 1.31±0.38㎝, 110±0.08㎝ and 62± 0.04 ㎝, respectively. The effects of breeds on major economical traits were significant statistically(P$lt; 0.05). Duroc showed the highest values of average daily gain and body height, and the shortest age at the 90㎏ of body weight. Meanwhile Landrace had the thinest backfat thickness and the longest body length. Sex, parity, furrowing year and month also significantly(P$lt; 0.05) influenced on the economical traits examined.