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Oviposition and offspring fitness of Aphidius gifuensis(Ashmead)on three aphid species,Sitobion avenae F.,Myzus persicae(Sulzer)and Aphis gossypii Glover were investigated according to no choice test and observation of oviposition behavior.A.gifuensis produced more mummies and adult offspring on S.avenae and M.persicae than on Aphis gossypii.Mummy production was influenced by stab rate and percentage of super-parasitism.Fi generation from S.avenae and M.persicae was more female-biased and larger in size than those from Aphis gossypii.Although there were significant differences in development time of A.gifuensis in the three aphid species,the differences were generally shorter than one day.