Abstract: Taking the multi-antibacterial powders added into the polymer, after melt spinning into fibers, to make the fibers have high bacterial, far-infrared emission and negative oxygen ions features. This paper has studied the structure and multi-function properties of the polyamide fibers. Through scanning electron microscopy and spectrum tests, x-ray diffraction, thermal analysis and infrared spectroscopy, the research results indicates that the addition of the multi-antibacterial power has a certain affect on the polyamide fibers; functional testing results show that the multi-antibacterial polyamide fibers have excellent antibacterial effect, while far-infrared emission and the negative oxygen ion emission features also have good effect; and when the added proportion is 2%, the polyamide fibers have good structure stability and multi-function.