Abstract: An electrochemical dyeing method without salt used on cotton fabrics has been studied for the purpose of reducing the amount of salt in reactive-dyeing process.Some factors,such as applied voltage,beginning temperature of dyeing and electrified time,have been discussed.Relationship between K/S value obtained from the electrochemical dyeing of fabric without salt and these factors was analyzed especially.Compared with the general salty dyeing method,the electrochemical dyeing method without salt could raise the uptake of dyes remarkably.In addition,this method not only increased K/S value but also decreased the environment pollution which might be caused by general salty residual dye liquids.