Abstract: Graphene oxide (GO) was partially modified with ethylenediamine to obtain EGO, used as a modifier. Linear polyurethane containing silicone was firstly synthesized, using isophorone diisocyanate, polyether diol, hydroxyl silicone(HPMS) and dimethylol propionic acid as the main raw materials, then it was grafted onto the polyhydroxy hyperbranched polyurethane core(HBPU-0) from laboratory homemade, and finally it reacted with EGO to prepare ethanediamined GO/hyperbranched polyurethane containing silicone(EGO-HPMS/HBPU). The morphology and properties of the ethylenediamined GO-hydroxyl silicone/hyperbranched polyurethane composite emulsion and its films were characterized by FTIR, Raman, XRD, XPS, TEM, AFM, SEM and TG, and the effects of the contents of EGO and hydroxyl silicone oil on EGO-HPMS/HBPU composite properties were studied. The results show that EGO is stably dispersed in HBPU matrix when the amount of HPMS is 4wt% and EGO is 0.5wt%. Compared with the single modified material, the properties of the synergistic modified EGO-4wt%HPMS/HBPU composites are the best. The increase of the pyrolysis temperature under different mass loss displays the good stability of the material, and the 24 h water absorption reduces to 5.13%, and the water contact angle is 101.3°. The tensile strength and elongation at break of EGO-4wt%HPMS/HBPU are 11.18 MPa and 553.2%, respectively, to get hydrophobic and feeling smooth and soft composite products.