Abstract: The life table and the developmental duration of Neoseiulus (Amblyseius) californicus (Mcgregor) with the prey Tetranychus urticae Koch at constant different temperatures was studied in laboratory. The results indicated that the different immature stages N. californicus could complete their development. The developmental duration, the oviposition duration and the mean lifetime all decreased with the increased temperature, and the shortest developmental duration (5.70 days) was observed at 35℃. The highest mean number of eggs (64.89 eggsfemale-1), with the highest R0 (48.252 5), was observed at 25℃. The lowest (1.063 6) and rm (0.061 7) were observed at 15℃, and the highest (1.354 4) and rm (0.303 4) were obtained at 35℃.