Abstract: Block copolymers containing segments of polysulfone and polyhydroxyethers were synthesized by interaction of bisphenol A(Bis-A) with epichlorohydrin in the presence of dihydroxyl-terminated polysulfone oligomers with DMSO as solvent under alkaline condition. The block copolymers were characterized by infrared spectroscopy, dynamic mechanical behavior and their solubilities. In contrast to the simple physical blend,the polysulfone-polyhydroxyether block copoly-mers were transparent and displayed single glass transition temperature (T_g=130℃),while the blends of the homopolymers were opaque and displayed two glass transition temperatures(T_g1=95℃, T_g2=191℃). (Fig.1 and Fig.2)