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Danaus chrysippus L.(Lep.: Nymphalidae) is the most important pest on Calotropis procera in Bushehr-Iran. The larvae feed on the leaves and make some damages and losses on host. This study carried out on D. chrysippus life cycle in Bushehr from 2006 to 2007. For the life cycle studies, the eggs were collected from the nature and were developed in Petri dishes and 10× 12 plastic dishes from egg to adult at under laboratory condition (25±2 ºC and 22±2 ºC,% 60±10 RH and 16/8 L: D). The Egg, Larval and Pupal periods were frequently 3.4±0.1 and 4.5±0.1; 12.5±0.2 and 19.1±0.4; 9.8±0.3 and 14.6±0.7 days in 25 ºC and 22 ºC at lab. The total period from egg to adult was 26.07±0.8 and 37.08±0.5 days in 25 ºC and 22 ºC at laboratory condition.