Abstract: The effects of different body weights on egg production performance of Xianju three buff chickens was evaluated under cage conditions. The results showed that the daily egg weight, production rate, egg weight, egg numbers, egg length and egg width in heaviest body weight group were the largest. Egg weight and egg width were significantly different among the three groups, whereas the other indexes were not significantly different. Egg weight, egg length and egg width were positively correlated with the hen＇s body weight. Our findings would provide some valuable information on quality improvement, development and use for Xianju three buff chickens and other hen species.