Abstract: In 20 counties,11 provinces and autonomous regions,China,23878 galls were collected,which 3999 parasites(amounting to 30 species) were reared from.They belong to 11 famities (Hym.):Torymidae,Eurytomidae, Ormyridae,Eupelmidae,Eulophidae,Elasmidae,Pteromalidae;Encyrtidae,Scelionidae,Braconidae,Ichneummonidae.Among them,Torymus sinensis Kamijo,Torymus geranii (Walker),Eurytoma rosae Nees,Decaioma concinna(Boh),Decatoma variegata (Curtis),Ormyrus Punctiger var,rulifanus Mayr,Eupelmus urozonus Dalman,Tetrastichus sp.,which distribute extensively were studied further more.The relationship between parasites and parasites and chestnut gall wasp was assured.Through dissecting of galls and identification of parasite's larvae,it is certain that the natural enemies have a great influence on the dynamics of populations of chestnut gall wasp.