Abstract:Present paper, with optical light microscope and scanning electron micris-cope, deals with the morphological characters of eggs, mature larvae and pu-pae of main parasites of Dryocosmus kuriphilus Yasumatsu (Torymus sinensis Kamijo, T. geranii Walker, Eurytoma rosae Nees, E. setigera Mayr, Decatoma concinna (Bob. ), Eupelmus urozonus Dalman, Ormyrus sp. ). Preliminary resu-lts show that the differences of morphological characters in eggs, mature lar-vae and pupae are obvious. We also dicussed characteristics of mature larva,such as number and length of chaetae in epicranium and body surface, ante-nna shape, morph of mandible, structure of body surface, and the character-istics of egg, such as its colour, egg petiolule and its length, morph of eggbody. So the classification on groups of chalcidoidea by means of morphologi-cal characters of mature larvae is feasible.