The article was focused on the research of surface grafting of amination to the fabric of sea-island ultrafine polyester fiber of 0.25 dpf, dyeing with different types of acid dye at 100℃. In the experiment, after the surface of polyester fiber was grafted and dyed with acid dyes that do the best discussion of the number of grafting and breaking strength, measuring the lightness value of color and washing fastness at 4~5 grade.