Abstract: Actual loss rate of grain weight, morphological character and grain contents of ten resistant varieties were studied in wheat midge garden in Linfen, Shanxi Province from 1999 to 2004. The results figure out the main quantitative characters, qualitative characters and actual loss rate of grain weight of varieties with different wheat midge resistances. The analyzing results on grain biochemical matters show that phenols, tannins and soluble sugar are major secondary metabolic products relating to the wheat midge resistance, and phenols are particularly important. The study has provided important parameters in selective breeding and application of new varieties of wheat with midge resistance.