Abstract: In order to study the meat development value of princess chicken, the body size traits and slaughter performance of 12-week-old F1 hybrid offspring of princess chicken and frizzle chicken were measured and the correlations between different traits were analyzed. The results showed that body length, keel length and shank length of male F1 hybrid offspring were significantly higher than those of female chickens. The live weight, carcass weight, semi-eviscerated weight, semi-eviscerated ratio, eviscerated weight, chest muscle weight, leg muscle weight and heart weight of male chickens were very significantly higher than those of female chickens, the leg muscle ratio and wings weight were significantly higher than those of female chickens, but sebum thick of male chickens was very significantly lower than those of female chickens. Other indicators had no significant difference. There were highly significant and very highly significant correlations between the slaughter performance and body size in F1 hybrid offspring. The regression equation of related indicators was identified. This conclusion provided a certain theoretical reference for predicting slaughter performance indicators through a living body size measurements, and production performances of F1 hybrid offspring were improved significantly.