The reproduction and survival of the Moina macrocopa Straus under 25X3 and six salinities of seawater (2‰, 3‰, 4‰, 6‰, 8‰ and 10‰) has been studied.The experiment results show the total life span on a decrescendo basis varies with the increasing of salinity.Mean number of young produced per female and total number of young produced and the intrinsic increase rate (r_m) haven't significant differences (2‰-4‰).The results of the experiments also show that the appropriate salinity is 2‰-4‰, while lethal upper salinity limit of reproduction is 6%o.Finally, it is found that after short term training, the lethal upper salinity limit of reproduction and survival of Moina macrocopa may rech 8‰.