Abstract: In order to investigate the differences between bamboo fibers and cotton when dyed with reactive dyes,bamboo fibers were dyed with a middle temperature reactive dye yellow ED.The Influence of process parameters,such as temperature,salt and alkali on the dyeing properties of bamboo fibers were analyzed.The optimal pretreatment and dyeing process were determined through orthogonal tests: H_2O_2(30%)(5 g/L),Na_2SiO_3(2 g/L),pH 11.0,and temperature(95 ℃) for pretreatment and,NaCl(60 g/L),Na_2CO_3(25 g/L),and temperature (60 ℃) for dyeing.