To evaluate effects of water temperatures on nutrient releases of submerged plants in lake reservoir, COD, T-N and T-P releases of submerged plants were investigated for 60 days under different incubation temperatures (5℃ and 25℃) in columns. The amounts of COD releases by Carex dimorpholepis were 60.4 mg L-1 at 5℃and 78.0 mg L-1 at 25℃. In Miscanthus sacchariflorus, the amounts of COD releases were 62.5 mg L-1 at 5℃and 70.5 mg L-1 at 25℃. The amounts of T-N releases in Carex dimorpholepis at 5℃ and 25℃ were 45.8 and 60 mg L-1, respectively. In Miscanthus sacchariflorus, the amounts of T-N releases were 55.7 mg L-1 at 5℃and 61.0 mg L-1 at 25℃. At 5℃, the amounts of T-P releases in Carex dimorpholepis and Miscanthus sacchariflorus were 5.65 and 7.10 mg L-1, respectively. At 25℃, the amounts of T-P releases in Carex dimorpholepis and Miscanthus sacchariflorus were 8.70 and 8.18 mg L-1, respectively. In the column experiment, the amounts of COD, T-N and T-P releases by submerged plants at 25℃ were generally higher than those at 5℃.