One hundred eight Korean Native cattle, Hanwoo, were measured for subcutaneous fat thickness, longissimus muscle area and marbling score at 13 rib using real-time linear array ultrasound one night before slaughter. Ultrasonically measured predictions were compare to corresponding carcass measurements to determine accuracy of live evaluation. Correlations with carcass measurements were 0.67 for backfat depth, 0.84 for longissimus muscle area and 0.88 for marbling socre. However, scanned mean backfat depth was significantly(P$lt;0.05) thicker by 2.8 ㎜ than carcass measurement indicating that certain amount of backfat was removed arbitrary or accidently during skinning process. Ultrasonic measured longissimus muscle area was slightly less than carcass measurement without significance, the average absolute difference between these two measures was 3.2 ㎠. About 67 percent of ultrasonic evaluated marbling score was coincide with carcass evaluation, however 33 percent of live evaluation was incorrect and warrant further investigation.