This paper dealt with the effect of stocking density and food dose on the feeding response of Mangrove Red Snapper Lutjanus argentimaculatus.Groups of young L.argentimaculatus were separately reared at seven different stocking densities(1,2,3,4,8,12 and 16 ind/troop)and each with seven food densities(18.4×10^-2,27.6×10^-2,36.8×10^-2,46.0×10^-2,55.2×10^-2,64.4×10^-2 and 73.6×10^-2 g/troop).The results showed that under the condition of dosed feeding,feeding quantity per time each fish increased with the rise of the population,and then decreased when up to some stocking density,significant difference was found between 1 ind/troop and other troops(P<0.01),with the lowest troop mean value of one-time feeding amount;under the condition of same stocking density,average value of one time feeding increased with the rise of feeding dose,and then decreased.As the rise of stocking density,the maximal feeding quantity in different density troops increased with the rise of feeding dose;As the rise of feeding dose,the maximal feeding quantity in different doses troops occurred in groups of 2-8 ind/troop.Results above showed that stocking density,feeding dose and their reciprocal reaction had a significant effect on one-time feeding quantity of young L.argentimaculatus over the experimental period,showing the reciprocity of group inhabitancy and competitive effect are significant.