The rhythm of efficiently discharging sewage from pond cage buckets was studied to ensure the timely and effective removal of feces and residual bait in the buckets while reducing the energy consumption of sewage discharge equipment to safeguard the water quality in the cage buckets.Two captive densities including 1 000 fish/bucket and 600 fish/bucket were used to conduct experiments on the aquaculture of Micropterus salmoides（largemouth bass） and the discharge of pollutants from cage buckets with the concentration of total suspended solids（TSS） and turbidity of the water at the sewage outlet as the experiment indexes.The changes in water quality at the sewage outlet after feeding was studied.On this basis，experiments of optimizing the rhythm of sewage discharge were conducted within 1-7 hours after feeding with the goal of achieving no significant difference in the content of ammonia nitrogen between the sewage outlet of the cage buckets and the water body of the outer pond.The results showed that the concentration of TSS and turbidity of the water at the sewage outlet increased sharply after the start of feeding，and did not stabilize until 7 hours after feeding.Multiple discharges of sewage in short term were more conducive to improving the water quality in the cage buckets，and different captive densities required different rhythms of sewage discharge.When the captive density was 1 000 fish/bucket，the rhythm of sewage discharge was “5 minutes of sewage discharge at 2 hours after feeding，3 minutes of sewage discharge at 4 hours after feeding，and 3 minutes of sewage discharge at 7 hours after feeding”.When the captive density was 600 fish/bucket，the rhythm of sewage discharge was “5 minutes of sewage discharge at 3 hours after feeding and 3 minutes of sewage discharge at 5 hours after feeding”The cumulative removal rate of TSS and turbidity for 1 000 fish/bucket under the optimized rhythm of sewage discharge increased to 98.46% and 97.86%，both higher than that of 26.83% and 18.32% under the traditional sewage discharge method with 5 minutes of sewage discharge at 2 hours after feeding.The cumulative removal rate of TSS and turbidity for 600 fish/bucket reached 94.58% and 96.86%，significantly higher than that of 24.32% and 19.36% under the traditional sewage discharge method.