Abstract: This article investigated the effect of different degumming processes on the physical properties of pineapple leaf fiber.Pineapple leaf finer was modified by concentrated NaOH solution.Cotton,ramie,modified and unmodified pineapple leaf fibers were dyed with reactive dyes respectively.The results of experiments showed that the dyeing behavior of the pineapple leaf fiber is between those of cotton and ramie.Modified pineapple leaf fiber has better adsorption and building-up on reactive dyes and can be dyed medium to deep shades with reactive dyes.