The preparation and properties of copper ion antibacterial modified polyacrylonitrile fibers,as well as their applications in fabric development were introduced.Copper ion antibacterial modified polyacryloni-trile fibers have excellent antibacterial properties.The results showed that in the process of fabric develop-ment and production,in order to achieve 95%antibacterial performance of the fabric,the content of copper ion modified polyacrylonitrile fibers should not be less than 5.8%by mass,which can better play the role of copper ion antibacterial modified polyacrylonitrile fibers.