Abstract: To investigate the effects of temperature on the population growth of Therioaphis trifolii (Monell) (Homoptera: Aphididae), a laboratory experiment was conducted to study the development, reproduction, and life table of the spotted alfalfa aphid at nine constant temperatures ranged from 15 to 35 ℃. The aphid could not survive at 35 ℃.The total nymphal period shortened significantly with increasing temperature. From birth to adult stage, it required 18.33 days at 15 ℃, but only 4.02 days at 32 ℃. The survivorship of the nymphs ranged from 40.0% （32 ℃） to 83.6% （25 ℃）.  The average longevity of the adults ranged from 10.64 days at 32 ℃ to 20.87 days at 23 ℃. The reproductive peak was advanced with increasing temperature, and the reproduction duration at all test temperatures was 3-6 days except that at 15 ℃ (15 days). The average fecundity and the highest fecundity were the highest at 25 ℃, being 82.0 and 149.0 offspring per female aphid, respectively. When the temperature increased, the mean generation time  was gradually decreased from 31.17 days at 15 ℃ to 10.17 days at 32 ℃. The net reproductive rate  was the highest (6862) at 25 ℃ and the lowest (13.96) at 32 ℃. The intrinsic rate of increase  was 0.10-0.30 per day, with the highest at 28 ℃ but the lowest at 15 ℃. The developmental threshold temperature and thermal constant of the nymphs were 9.35 ℃ and 97.83 daydegrees, respectively. Unary quadratic equation could be used to describe the relationships of the fecundity, net reproductive rate, and intrinsic growth rate with the temperature.