Abstract: Two hundred and forty 1dayold Arbor Acres healthy broiler chickens were used to conduct feeding and comparative slaughter experiments for 42 days. Body weights and corresponding body compositions of chicks were measured at weekly intervals. Gompertz equation was adopted for modeling the growth cure of sexes. Correlations between the weights of carcass protein, feather protein and live body weight of birds at various times were described with different mathematic equations, respectively. The corresponding optimal models screened out were combined with growth curve equations, separately. Differential functions reflected relationships of body gain, carcass protein gain, feather protein gain change with age were established, which imply accurately the laws of growth and protein deposition in broiler chickens.