A series of modified-polyester hollow fibers were prepared by blend spinning of PET and a PET-based- co-polyester with different content of sodium 5-sulfonate-isophthalic acid with spinnerets for different cross section shape of biers．The tensile strength of the fibers first decreased with their sulfonate group content and then leveled off．The

dye-uptake of fibers to Basic Blue GB was improved with the increase of the sulfonate group content

and it did not show obvious influence on the uptake of disperse dyes．The dye-uptake of the fibers was not affected by their cross section shape

but greatly influenced by alkaline hydrolysis．The water retention and water transmissibility of the modified fibers were closely related with the micmcellular structure of fibers formed after alkaline hydrolysis and the capillary effect among profiled fibers．