The grain aphid(Sitobion avenae Fabricius) is an important pest of wheat.From 2002 to 2005,thirty-four accessions with the different degree of resistance to the aphid were screened out of 2000 wheat germplasm,accounting for 1.7% of the whole varieties,including five highly resistant accessions,nine resistant ones and twenty moderately resistant ones by the method of aphid index.A part of resistant and susceptible was assessed through glasshouse screening of seedling technique and the result indicated that resistance in the seedlings and adult wheat was similar.Genetic analysis of resistance was performed using the F_1 plants and F_2 populations derived from a cross between the resistant Linyuan207 and susceptible Witchita.The result showed that a single dominant gene conditioned the resistance in Linyuan207.