Abstract: On the basis of the shielding mechanism of the electromagnetic shielding clothing,the simulation experiment was designed,and the influences of radiant frequency,radiant distance,clothing fabric,seam quality and size of needle hole on the shielding efficiency of electromagnetic shielding clothing were investigated.The notability of these factors on the clothing shielding efficiency was examined.Regarding these factors as the variables,a mathematics model of clothing shielding efficiency was set up,and the verification of stability and practicability to this model was carried out.The result indicated that the mathematics model applies to the clothing shield efficiency calculating is advisable.