Abstract: The bacteriostasis effect of nonwovens was imparted by treating with the home_made dispersing system of antimicrobial powder.The bacteriostasis effect of the treated nonwovens was tested by inhibition zone method.The relationship between the content of nanosized colloidal silver powder on nonwovens and the effect of bacteriostasis was analyzed,and the suitable range of nanosized colloidal silver content for different materials of nonwovens were determined,i.e.,polypropylene nonwovens 4%～6%(o.w.f);viscose nonwovens 6%～10%(o.w.f);cotton nonwovens 3%～6%(o.w.f).