This investigation was conducted from April 1, 1971 to December 31, 1971 to study the body measurements, weaning weight, and dressing percentage of Cheju native cattle, using 99 cows and 21 bulls, 120 heads in all. 1. Cheju cattle were smaller than Korean native cattle in the mainland. For males, the body weight was 314.80±13.85㎏ and 274.30±4.38㎏ for females. For males, the withers height was 117.50±1.28㎝ and 114.43±1.46㎝ for females. The body length for males was 132.6±2.23㎝ and for females 126.30±0.64㎝. 2. The weaning weight of Korean native cattle was similar than that of Cheju cattle, 104.11±1.81㎏, It appears that Cheju cattle are smaller than Korean native cattle due to environmental factors than genetic factors. The considerable environmental factors are working too early, reproducing too soon, and feeding on rough feed. 3. The dressing percentage of the bulls for Cheju cattle was 51.87%. This is lower than that for foreign beef cattle, but nearly the same as for Korean native cattle. 4. The correlation of carcass weight to the combined weights of fore shank, rear shank and other meat is +0.5. 5. The high correlations between carcass percentage and body type were observed for the withers height and hip height. To improve Cheju native cattle to the standard of beef cattle, it appears useful to pay attention not only to chest depth and chest girth, but also to withers height and hip height.