This study was to invesigate the effect of dietary supplemention of Pozzolan, Chromium-methioninechelate and rhus verniciflua stokes additive feed on growth performance and ultrasound live bodycharacteristics in finishing Hanwoo steer. The animal used in the experiment were a total of 17 heads andweighted 577.09±35.90㎏. The experimental diets were basal hi-lok branded only concentrat and rice strawand 4% Rhus, 0.4% Cramin and 2% Pozzolan, which additice in basal diet. Individually average daily gainwas tended to decreased with treated group. Ultrasound back fat thickness and marbling score were notsignificantly different(p<0.05)between teratment, however Pozzolan additive treat was showed tend toincreased. Longissimus muscle area was showed tended to decreased in the Pozzolan treatment.