This experiment was conducted to study the effects of dietary methionine levels on the growth performance， digestion and absorption related indexes and antioxidant capacity of juvenile Micropterus salmoides. 1 440 largemouth bass with an initial body weight of （0.18 ± 0） g were selected and randomly divided into 6 groups （each group had 4 replicates， with 60 replicates each）. They were raised in nylon cages with a water volume of 50 L in an outdoor aquaculture system， and fed with equal nitrogen and fat feed ranging from T1 to T6（methionine additions of 0， 0.5%， 1.0%， 1.5%， 2.0% and 2.5%， with measured values of 0.67%，1.08%，1.43%，1.78%，2.22% and 2.61%，respectively）. The experimental period is 30 days. The results showed that as the feed methionine level increased， the weight gain rate， specific growth rate， and protein deposition of the experimental fish first increased and then decreased， and the feed coefficient first decreased and then increased. The weight gain rate and specific growth rate of the 1.08%， 1.43%， 1.78%， 2.22% and 2.61% groups were significantly higher than the 0.67% group （P<0.05）， and the feed coefficient was significantly lower than the 0.67% group （P<0.05）； With the increase of feed methionine levels， the activity of trypsin in the intestinal tract of experimental fish showed a trend of first increasing and then decreasing， with the highest in the 1.78% group， and had no significant effect on other intestinal enzyme activities； With the increase of feed methionine levels， the activities of GSH-Px， CAT， T-SOD， and LZM in the liver of experimental fish first increased and then decreased. CAT， T-SOD， and LZM activities were highest at 1.78%， significantly higher than those in the 0.67% group（P<0.05）. Using specific growth rate as an evaluation indicator，the demand for methionine in juvenile largemouth bass is 1.72%， accounting for 3.23% of the feed protein.