This experiment was carried out to find the best castration method for economical body gain and the improvement of the pork quality by preventing the sex odor. Including three female pigs, twelve heads of pigs, 50days old, were assigned into four groups, three pigs each by the completely randomized design. Except female group for control, the rest three groups were treated by the different castration; complete castration, cryptorchidism (short scrotum), and partial castration, and fed for 21weeks under the sane feeding condition. During the feeding period, the body gain and he feed consumptions were checked periodically for daily gain and feed efficiency. After the finishing of feeding, all the pigs were slaughtered and the carcass data, were collected and analyzed. The results obtained were summarized as follows; 1. The average total gain of completely castration, cryptorchidism, partial castration and female groups were 73.17, 81.50, 78.57 and 60.33kg respectively. However, there were non-significant differences for daily gain among each groups. 2. Feed consumption was non-significantly differed between four groups and they shown the same tendency in feed efficiency and body weight gain. 3. Dressing percentage was non-significant difference among the treatments. The whole average of dressing percentage was 68.3% 4. The ratio of carcass width(W) to carcass length (L) was about 41% in cryptorchidism and complete castration, but 46% in partial castration. 5. The backfat thickness indicated slightly lower in cryptorchidism (2.33㎝) than partial castration (2.63㎝), which was slightly lower than commonly-fattend swine. In loin eye muscle area, cryptorchidisn (31㎠) showed a little greater than complete castration (29㎠) and partial castration (30㎠).