Experiments were carried out to investigate the burrowing ability of juvenile ark shell Anadara broughtonii(2-3 cm shell length),and the predation rate on juveniles by sea star(Asterias amurensis)at different seawater temperatures(10,15,20,25 and 30 ℃,respectively).The results showed that A.broughtonii had the longest burrowing time(28.87 min)and the lowest burrowing rate(21.25%)at 10 ℃,which were significantly different from other temperature treatments(P<0.05).The shortest burrowing time(7.49 min)and the highest burrowing rate(55.63%)were observed at 20 ℃,suggesting that 20 ℃ was the suitable burrowing temperature.The predation rate at 20 ℃(5.28 ind/d)was significantly higher than those at 10 and 25 ℃(P<0.05).The optimum predation temperature was between 15 and 20 ℃ and the Q₁₀ coefficient for A.amurensis was 2.22 in that range.The overlap of the optimum temperature range was observed for A.broughtonii burrowing and preyed by A.amurensis,suggesting that protective strategies for juvenile A.broughtonii are needed when the water temperature is close to 20 ℃.