Wool was treated by a chicken-feather keratin agent, plasma, and their combination. These treated wools were characterized with Fourier transform infrared spectroscopy and scanning electron microscopy. The performance properties, such as the antifelting performance, wettability, and dyeability, of these treated fibers were tested. The results show that the antifelting performance, wettability, and dyeability of the wool modified by plasma combined with the chicken-feather keratin were improved. This joint treatment technology is an environmentally friendly green ecological finishing technique. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 1627-1634, 2011