Polyoxypropylene glycol (PPG),bihydroxy hydrophilic polysiloxane polyol(UC3667) as the soft segment,isophoronediisocyanate (IPDI), 1,4-butanediol (BDO), dimethylolpropionic acid (DMPA) and ethylenediamine (EDA)as the hard segment,a series of waterborne polyurethanes(WPUs)were prepared based on polysiloxane.The effect of polysiloxane on the particle size and stability of waterborne polyurethanes emulsion was investigated by Malvern laser particle size analyzer. The structure of waterborne polyurethane was characterized by infrared spectroscopy (FTIR), and the tendency of silicone to move to the surface of the film was analyzed. The thermal stability, mechanical properties and surface properties of waterborne polyurethane films were characterized by thermogravimetric analysis, contact angle and X-ray photoelectron spectroscopy. The results showed that when the content of polysiloxane increased, the tensile strength of waterborne polyurethane films increased firstly and then decreased; and the introduction of polysiloxane improved the thermal stability, elongation at break, contact angle of waterborne polyurethane films and reduced surface energy. Whenthe content of polysiloxane is 5.0%,polysiloxane migration on the surface of the film reached saturation, and the surface energy is 27.27 mJ/m2.