787 Bashang long-tail chickens including 379 cocks and 408 hens were chosen to study the growthand development in brood stage. The results indicated that with the growth of the chickens their appearancechanged gradually. Males and females of Bashang long-tail chickens with black, hemp feathers, reed catkins, whiteflower, and silver grey feathers have the similar birth weight. The birth weight of roosters with white feathers was sig-nificant higher than that of hens. The birth weight of chickens had no significant difference among roosters or henswith different feather color. Their weight increased slowly before 2 weeks old, and then, the males got a highergrowth rate than the females. With the growth of the chickens the difference of body weight between roosters andhens with white feathers become larger, the difference of body weight between roosters and hens with black, hempfeathers, and white flower feathers appeared. The body weight of roosters with white feathers was significant higherthan that of black at 2 weeks old. The body weight of hens with different feathers was different. The absolute growthcurve was on the rise and the relative growth curve was on the decline.