Polydnaviruses（PDVs） have a symbiotic association with hymenopteian parasitoid wasps in the fami-ly of Braconidae, Ichneumonidae and Aphidiidae. They are delivered into host hemolymph accompanying with theparasitoid egg laid during oviposition to serve to disrupt host immune system to ensure the survival of the wasps’ progeny. Recent progress on braconid PDV characterization and gene families including PTP and EP 1-like relatedto immune suppression was reviewed. The morphological characteristics and physiological effect of polydnaviruswere firstly discovered in Aphidius gifuensis and aphids mode system.