Based on the vulnerability mechanism of wireless receivers,this paper proposes a method to construct a complex electromagnetic environment based on the vulnerability mechanism of the receivers,which solves the problem that a great amount of electromagnetic environment simulation equipments are needed for the combating unit with large frequency span. A multi-excitation,multi-response sleeve barrel evaluation model is built,which is based on signal channel occupancy,spectral overlap degree,background signal intensity and other factors in electronic information system. It solves the problem of the objectivity and figurativeness evaluation of the tested object,and supplies a useful reference for complicated electromagnetic environment adaptability identification.