Abstract: Dyeing behavior of cotton fabric modified with PECH-amine was investigated.The results show that compared with the unmodified cotton fabric,the modified fabric can be dyed with direct and reactive dyes without salts under neutral conditions,dye uptake is improved obviously,and the fixation rate of reactive dyes is enhanced.When dyeing the same depth of shade,80% of dyes can be economized. The performance indexes of the dyed fabric of modified cotton have reached the requirements in class A of GB 18401—2003.The dye effluent is conformed to Level II Standard of "Waste Water Discharge Standard for the Textile Dyeing and Finishing Industry"(GB 4287—1992).Clean dyeing whose effluent contains zero salt and little dye has been realized.