Seven Sanhuang chicken carcasses, which were 50d old and the carcasses weight was in the range of 1.741~2.508kg, were selected as experimental samples. Their body size parameters, eviscerated weight, main organs weight and viscera weight were measured and then the relationships of these parameters with the carcass weight were analyzed and investigated. After the sample’s crosssectional images were captured by using a spiral CT machine, the relative positions of heart, lung, stomach, kidney and other major viscera were observed and in the same time, the visceral cavity size and the position and size of the eviscerated incision were estimated according to these images. Experiment results showed that their breast depth and shank length were gradually increased with the raise of carcass weight of Sanhuang chicken. Furthermore, the body length, breast width and shank circumference were significantly increased (P<0.01) linearly as the carcass weight was increased. The weight of heart, lung, stomach muscle and kidney also showed a trend of increase with the rise in carcass weight, which had certain relevance. In addition, the relative position of the heart, lung, muscle stomach and kidney could be clearly determined based on the horizontal and vertical crosssectional CT images of carcass;for the Sanhuang chicken samples with carcass weight distribution of 1.741~2.508kg. The estimated cavity size was (15.560±0.540)cm long, (7.22±0.253)cm wide, and the maximum incision length was (4.783±0.467)cm.