This study was to investigate the scouring and bleaching efficiency of blended yam with chitosan/nano-silver composite fiber(CSY) and its knit(CSK) compared with common cotton yam(CMF) and knit(CMK). The scouring and bleaching efficiency were analyzed by weight loss, whiteness and reflectance. The variation of bacterial reduction in various concentrations of hydrogen peroxide and alkalis(soda ash, caustic soda) was assessed. Significant change of physical properties of CSY(CSK) compared with CMY(CMK) was not observed. However, the antibacterial properties were dominantly influenced by pre-treatment conditions.