Global warming causes an increase in the average temperature butalso the intensity and frequency of extreme climatic conditions, such as short heat notoly waves. Extreme temperatures can impact parasitoid growth and development in hosts. Therefore, to understand the effect of heat waves on parasitic natural enemies of insect pests, we made laboratory experiments to examine developmental performances of the offspring of the solitary endoparasitoid,Meteorus pulchricornis, using Spodoptera litura larvae as hosts. Offspring parasitoids in the hosts received the heat shock treatment by 39℃ for 4 hours at the age of 1,2,3,4,5, or 6 days old after parasitism. Developmental survival,duration,adult body size,and longevity of offspring parasitoids were observed. Larval survival to pupa decreased in the host larvae that received the heat treatment at the age of 1 d and 5 d, by 36.1% and 28.6%,respectively, compared to controls. Larval duration was prolonged by 5.0%, 5.2%, 7.0%,and 12.1%,respectively, in the host larvae that received the heat treatment at the age of 2,3,5, and 6 d, respectively, compared to control. Adult hind tibia length decreased by 1.8% and 2.6%,respectively, in the hosts that received the heat treatment at the age of 5 and 6 d. Pupa-to-adult duration, pupa-to-adult emergence rate, and adult longevity were not influenced by the heat shock treatment. The results of the present study suggest that older larvae of M. pulchricornis were more vulnerable to heat waves than younger ones.