not in Young The reproduction biology of Diachasmimorpha longicaudata was studied by construction of experimental population life table of D. longicaudata reared in oriental fruit fly, Bactrocera dorsalis. D. longicaudata had a pro-oviposit period for 1 to 3 days, depending on adult' s food and copulation. The peak of reproduction activity appeared in 4 to 10 days after adult emergence, and one female could breed about 125 offspring, however, the number of daily parasitized larvae of D. longicaudata was no more than twenty. The net reproduction rate (Ro) and intrinsic increase rate (rm) were 44. 44 and 0. 158 1, respectively. The sex ratio of female to male was close to 2: 1. It was showed that D. longicaudata was re-leased in the ratio ( parasitoid: fly) of 1: 1, 1: 5 and 1: 10 in carambola orchard resulted in parasitisms of 36. 01%, 12.50% and 5.18%, respectively, in 15 days after releasing. Bactrocera dorsalis (Tephritidae): Host; Diachasmimorpha longicaudata (Braconidae): Parasite. Chinese none