The experiment was conducted to study the effects of microcapsule lysine (Lys) and methionine (Met) on the growth performance of grass carp (Ctenopharyngodon idellus). The grass carps with an average body weight of (62.7±0.89) g were fed with the basal feeds added with 0, 0.2% microcapsule Lys, 0.3% microcapsule Lys, 0.4% microcapsules Lys, 0.15% microcapsule Lys+0.15% microcapsule Met, and 0.2% microcapsule Met for 97 days, respectively. The results showed that the specific growth rates (P>0.05) of the microcapsule amino acid groups were higher than that of control group except for 0.2% and 0.4% microcapsule Lys groups; the feed coefficient ratios (P>0.05) of the microcapsule amino acid groups were lower than that of control group except for 0.4% microcapsule Lys group. The protein deposition rate (P>0.05) of the microcapsule amino acid groups were increased compared with control group, as well as the crude protein content of muscle and hepatopancreas (P>0.05 or P<0.05). The liver to body ratio (P>0.05 or P<0.05) and the gut to body ratio (P>0.05) of the microcapsule amino acid groups were lower than that of control group. The results indicated as follows: 1) adding with microcapsule amino acids to feeds of grass carp could improve the growth of grass carp, decrease feed conversion ratio, increase the protein deposition rate, but adding excess microcapsule Lys slowed down the growth of grass carp, and 0.3% microcapsule Lys supplementation was the optimum; 2) adding microcapsule amino acids to feeds could decrease the liver to body ratio and the gut to body ratio of the grass carp, and improve the protein content in muscle and hepatopancreas. ［Chinese Journal of Animal Nutrition, 2010，22（3）:804-810］