The flea beetle, Agasicles hygrophila Selman and Vogt, is an effective biological control agent of the alligator weed, Alternanthera philoxeroides (Mart.) Griseb.. To investigate the optimal temperature for the reproduction of A.hygrophila adults and the optimal duration of low temperature preservation of A.hygrophila eggs, we compared the survival, leaf consumption and fecundity of A.hygrophila adults under verying temperature regimes (25~35 ℃) as well as egg hatching rate following various durations of exposure to 15 ℃. The survival and longevity of A.hygrophila decreased with the increasing temperature, although the survivorship at 27 ℃ and 30 ℃ did not differ significantly to that at 25 ℃ and 32 ℃, respectively. Leaf consumption and fecundity of A.hygrophila adults decreased significantly with increasing temperature from 25 ℃ to 35 ℃. Leaf consumption per pair during their adult stage, average daily fecundity, fecundity per pair during their adult stage ranked as 25 ℃>27 ℃, 30 ℃ > 32 ℃ > 35 ℃. There was a significant positive correlation between leaf consumption and adult fecundity. Storing unhatched eggs at 15 ℃ for up to 10 days did not decrease their viability. Compared with the untreated eggs, A.hygrophila eggs started to hatch one day earlier after treated at 15 ℃ for 1 d, with a peak on the fifth day. These results indicated that 25 ℃ was an optimal temperature for the survival, leaf consumption and fecundity of A.hygrophila adults, while 35 ℃ was the most unsuitable temperature.