Abstract: The advantages of reactive dye/D5 suspending system dyeing are water-saving and salt-free, therefore, this method can overcome the pollution of traditional dyeing waste that contains excessive amount of salt. Taking the color depth (K/S value) as the evaluating index, the process factors in dyeing such as temperature, dyeing duration, pick-up ratio of alkali solution on fabric, as well as the alkali concentration were optimized by Single factor and orthogonal experiment . The results show that, the optimal dyeing process was : pick up rate 140%, Na2CO3 110g/l, temperature 80℃, time 50min. The dye up-taking of reactive dye/D5 suspending system dyeing was close to 100%. K/S value and total fixation was almost perfect and very superior to that in aqueous system

Key words: dyeing, reactive dye, cotton fabric, decamethyl cyclopentasiloxane(D5), dye∕ D5 suspension system