The present study was carried out to study the effect of three constant temperatures (20, 25 and 30^oCeach ±1^oC and 65±5 % R.H.) on Chrysodeixis chalcites (Esper).  The duration period of immature stages, preoviposition, postoviposition periods and life cycle of C. chalcites were significantly affected by different  temperatures. The thresholds of development (t₀) were 4.8, 2.7 and 4.6 ^oC for eggs, larvae and pupae, respectively. The thresholds of development (t₀) of life cycle and generation were 3.7 and 4.3 ^oC, respectively. Also, the thresholds of development (t₀) were 9.8, 10, 5.4 and 4.7 ^oC for female longevity, male longevity, female life span and male life span, respectively .