A metallic modification technique on fabric is put forward in this paper. Morphologies and element analysis of modified fabric samples with copper and nickel-iron double films were carried out by using SEM and EDX. Shielding effectiveness (SE) on the samples was tested within 0.1 similar to 1000MHz and 1.5 similar to 18GHz. Within 0.1 similar to 1000MHz, modified fabric SE is between -93dB and -110dB. Two nickel-plated methods were compared. The measurement results of two modified fabric indicate that nickel-iron alloy films are better than nickel film on SE. With the advantages of low cost, flexibility, high electromagnetic protection characteristics, the modified fabric has a widely applicable foreground.