The present study explored the Asterias amurensis(4-8 cm)selective feeding on Ruditapes philippinarum(20-40 mm)at different temperatures(5,10,15,20,25℃)in laboratory conditions.The prey profitability,prey size selectivity,total consumption and feeding rate were used to analyse the effects of temperature,predator size and prey size on selective feeding of A.amurensis.Results showed that prey profitability were significantly affected by both the predator size and prey size(P<0.000 1).No significant effects of temperature on the prey profitability were observed(P=1.000 0).According to prey profitability model,four kinds of A.amurensis got maximum when they fed on those preys by 20,23,30 mm and 35 mm respectively.The values were 0.62,0.70,0.83 and 0.94 mg/min.The predictions were in accordance with experimental results.Within temperature range from 5 to 15 degrees and A.amurensis from 5 to 8 cm,the prey consumption increased as the temperature went up,and reached the maximum consumption at 15℃,which was the optimal temperature for A.amurensis.The values were 0.37,0.45 and 0.54 g/d.The prey consumption decreased with the increase of temperature when higher than 15℃.Significantly higher feeding rate was observed by day than at night.It's concluded that in May and June,the temperature of Qingdao was the suitable for the reproduction of R.philippinarum and the most suitable for A.amurensis's feeding and growth.Therefore,the prevention and clearing of starfish should be reinforced.