[Objectives]  The English green aphid, Sitobion avenae (Fabricius), is one of the most important pests of winter wheat crops in China. The wasps Aphidius avenae Haliday and A. gifuensis Ashmead are two important parasitoids of S. avenae. Comparison of the behavioral responses of these species to the aphid pheromones (E)-β-farnesene (Eβf) and nepetalactone (NEP) was performed to improve the scientific application of aphid pheromones. [Methods]  A four-arm olfactometer was used to determine the behavioral responses of A. avenae and A. gifuensis to different dose thresholds of Eβf and NEP. [Results]  Female A. gifuensis were significantly (P<0.01) attracted to higher doses (1 μg·μL^-1, 0.1 μg·μL^-1) of Eβf, whereas female A. avenae were significantly attracted to lower doses of Eβf (0.01 μg·μL^-1, 0.001 μg·μL^-1) (P<0.01). Both female A. gifuensis and female A. avenae were significantly attracted by 0.1 μg·μL^-1 Eβf (A. gifuensis: P<0.01; A. avenae: P<0.05). A. gifuensis were also significantly attracted to the four candidate doses of NEP (1 μg·μL^-1, 0.01 μg·μL^-1：P<0.01；0.1 μg·μL^-1, 0.001 μg·μL^-1：P<0.05), but A. avenae was not. The highest parameter selective coefficient of olfactory behavior was recorded in A. gifuensis in response to 1 μg·μL^-1 Eβf or NEP, whereas that in A. avenae was only recorded at a dose of Eβf 0.01 μg·μL^-1. [Conclusion]  Eβf or NEP could be as used as semiochemicals to attract these two parasitic wasps. A. gifuensis is attracted by Eβf or/and NEP whereas A. avenae only appears to use Eβf as a chemical cue over for locating aphid hosts in wheat fields.