The allometric relationships between body composition and components in broilers were investigated to establish the growth model to predict the growth of broilers. One hundred and eighty one-day-old Arbor Acres (AA) broilers were randomly arranged into 2 treatments with 5 replicates of 18 chicks by sex. Broilers were fed the standard diet which was formulated according to requirements of National Requirement Council. At 1, 7, 14, 21, 28, 35 and 42 days old, after being weighed, two broilers with body weight near to the average weight of each replicate were chosen and slaughtered, and the body composition and components were determined. The trial data collected were fitted with curve regulation by statistical software. The results showed that the power function could well describe the relationships between carcass, feather and body weight, the relationships between body water, fat, ash and body protein, the relationships between carcass water, fat, ash and carcass protein, and the relationships between feather water, fat, ash and feather protein. The fitted equations were tested through F-test, and the results showed that the fitted equations were all significant (P<0.01), and the correlation indexes (R2) of fitted equations were all above 0.950. These results indicated that the fitted allometric equations with power function could be well used to predict the body composition and components of broilers.［Chinese Journal of Animal Nutrition, 2010，22（3）:564-570］