This research is to treat the effect of the electromagnetic wave absorption of stainless steel weft knitting fabrics. Different percentages of stainless blended yams, different densities of needle and weaving ways are used to make the knitting film. The electromagnetic wave absorption and the wide frequency of electromagnetic wave are increased by utilizing the different knitting ways that increase the tridimensional shape of knitting film. From the result that know the best knitting fabric is rib stitch and the highest electromagnetic wave absorption can reach 62%.