The intrinsic rate of increases(r_m), fecundity, longevity, reproduction interval, brood numbers and pre-reproduction period of two strains of Moina mongolica (Jinnan and Neimeng) were studied under 15℃,18℃,25℃, 28℃ and 32℃.Relevant population characters of two strains of M.mongolica at 28℃ were also studied.The results indicated that temperature is very importance to the reproduction of two both strains.The pre-reproduction period, reproduction interval, longevity decreased with increasing temperature in this experiment, also r_m, fecundity and brood numbers increased with temperature from 18℃-28℃, while decreased with temperature > 28℃.The optimum temperature for population growth of two strains was 28℃ and the range of suitable temperature for population growth was 28 to 32℃.The intrinsic rate of increases of Jinnan strain was higher than those of Neimeng strain, even if the experimental temperature reached 28℃, From the comparison of the resultant data, we are of the opinion that the population growth capacity of Jinnan strain is higher than that of the Neimeng strain, whereas Neimeng strain has stronger thermal adaptability.