Abstract: Oviposition and longevity of the Diamondback Moth, Plutella xylostella L. at 15, 20, 25, 30, 35℃ temperatures were monitored in laboratory experiments. The mean preoviposition and oviposition periods were in negative relation to temperature. The mean number of eggs laid by moth decreased dramatically and 37.5% adult females failed to oviposit at 35℃, compared to other tested temperatures. Eighty percent of total eggs were laid in the first 3 days after the moths beginning to oviposit at each temperature, and the period of time for so many eggs to be laid became shorter with temperature increasing. Longevity of the adult females of the moth decreased from 46.4 days at 15℃ to 3.6 days at 35℃, negatively correlating with temperature (r=-0.981, P<0.05). Based on the above results, patterns of population dynamics of the diamondback moth were discussed.