Sulphonated waterborne polyurethane (SWPU) emulsions were synthesized by the reaction of polyethylene glycol adipate diol (PBA) and isophorone diisocyanate(IPDI) , hexamethylene diisocyanate (HDI), and N-(2-aminoethyl)-amino ethane sulphonated sodium was used as hydrophilic chain extender. The influences of the feeding methods and chain extension time of AAS on performance of SWPU were investigated by using FT-IR, TEM, XRD and so on. The results showed that when the one-time feeding mode of AAS was applied and the chain extension time was 25min, SWPU with 50% solid content was obtained, and the particles of SWPU were spherical shapes, the average particle size, viscosity and hardness were appropriate, and two sharp diffraction peaks at 2θ=21.30?and 22.34?in XRD indicated the crystallization of the synthesized sulphonated waterborne polyurethane films.