In this study, ,-bis(3-(1-methoxy-2-hydroxypropoxy)propyl)polydimethylsiloxane and -N,N-dihydroxyethylaminopropyl--butylpolydimethylsiloxane were used to prepare block and graft waterborne polyureathane-polysiloxane copolymer dispersions. ,-bis(3-(1-methoxy-2-hydroxypropoxy)propyl)polydimethylsiloxane was synthesized by hydrosilylation, methoxylation and equilibrium reactions; -N,N-dihydroxyethylaminopropyl--butylpolydimethylsiloxane was synthesized via hydroxyl protection, alkylation, anionic ring-opening polymerization, hydrosilylation, and deprotection. Block and graft waterborne polyurethane-polysiloxane copolymer dispersions were prepared by the reaction of poly(propylene glycol) (PPG), toluene diisocyanate (TDI), 2,2-dimethylol propionic acid (DMPA), 1,4-butanediol (BDO), ,-bis(3-(1-methoxy-2-hydroxypropoxy)propyl)polydimethylsiloxane, and -N,N-dihydroxy-ethylaminopropyl--butylpolydimethylsiloxane. The water absorption of block and graft waterborne polyurethane-polysiloxane copolymer films decreased from 163.9 to 40.2% and 17.3%, respectively, when percent of polysiloxane (w/w) increased from 0 to 5%, and the tensile strength of the block waterborne polyurethane-polysiloxane copolymer films decreased while the tensile strength of graft waterborne polyurethane-polysiloxane copolymer films increased with increase of percent of polysiloxane. For graft waterborne polyurethane-polysiloxane films, the tensile strength would decrease when percent of polysiloxane was more than 3%. POLYM. ENG. SCI., 54:805-811, 2014. (c) 2013 Society of Plastics Engineers