Abstract: In this new pretreatment,noble metals compounds were mixed with some special high polymer monomers,and then formed a uniform and stable dispersed system,where the terylene fabric was immersed in.As the temperature was elevated,high polymer monomers formed continuous network structure which restricted the metal in aggregating.Reduction of Pd2+and Ag+was carried out by the formed ammonia and noble metal-polymer catalytic film was formed in-situ,which could cause chemical plating of copper on the fabric no need of sensitizing the fabric with SnCl2.Preliminary investigation of the process was performed.When compared with the traditional pretreatment technology,this method is more convenient,non-toxic and reduces the amount of noble metals and production cost.The electromagnetic shielding material prepared by this method has many advantages such as smaller surface resistance and thinner.