Abstract:The present experiments were conducted under the conditions of 5 different constant temperatures: 10℃,15℃,20℃, 25℃ and 30℃, The results showed that the heigher the instar is, the shorter the development period become,except treatment of 10℃ in generation B. The most proper temperature for development is around 15℃ to 20℃. When the temperature exceeds 25℃, the mortalities become higher apparently.Development thresholds and accumulated temperatures vary owing to different instars.