Five species of hyperparasitoids of Diaeretiella rapae M' Intosh on aphids in vegetables field in Vt. Guangzhou, China, were found, and they are : Pachyneuron aphidis (Bouche), Syrphophagus aphidivorus (Mayr) , Alloxysta fuscicomis Hartig, Dendrocerus aphidum ( Kieffer) and Dendrocerus sp. ; P. aphidis is an important hyperparasitoid suppressing the natural population of D. rapae. However, the growth stages of D. rapae affected the development of P. aphidis. The results from experiment showed that the development duration of P. aphidis was 15.22 d in the stage of D. rapae in pre-pupa in 1 - 24 h significantly longer than in 30 pre-pupa in 48 - 72 h (12.21 d) , while the hyperparasitism of P. aphidis was 15% in pre - pupae of D. rapae in 1 -24 h significantly higher than in pre-pupa in 48 - 72 h (3% ). The development phases of P. aphidis including egg, 1st instar larva, 2nd instar larva, 3rd instar larva, pre-pupa and pupa, were described and their photos were given. Diaeretiella rapae (Aphidiidae) : Host, Parasite Pachyneuron aphidis (Pteromalidae) : Parasite Myzus persicae (Aphidoidea) : Parasite Life cycle and development; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts Diaeretiella rapae; Development; Hymenopteran hyperparasite development effect; hemipteran host; Development stage; Hymenopteran parasites; Pachyneuron aphidis; Hemipteran hosts; Myzus persicae; Hyperparasitism; Pachyneuron aphidis (Hymenoptera) Myzus persicae; Hymenopteran hosts; Diaeretiella aphidis; Hyperparasitism; Hyperparasite development; influence of hymenopteran host development stage; Pachyneuron aphidis (Hymenoptera) Pachyneuron aphidis; Development; Hymenopteran host development stage effect; Hymenopteran hosts; Diaeretiella aphidis; Hyperparasitism; Diaeretiella aphidis (Hymenoptera) none