Abstract: The functionalized graphene(FG-PEI)was prepared from graphite by oxidizing, modifying with poly(ethylene imine) (PEI) and reducing with hydrazine hydrate.The FG-PEI was mixed with UV waterborne polyurethane(WPU) to prepare FG-PEI/WPU composite coating adhesive to modify WPU. The structure of the FG-PEI was characterized by FTIR, XRD, Raman, XPS, SEM, TEM, the dispersibility of the FG-PEI was investigated, the influences of the dosage of FG-PEI on electrical conductivity, and the thermal stability and the mechanical properties of FG-PEI/WPU film were also studied. The results show that FG can be dispersed well in dimethyl formamide and WPU. With the increase of the dosage of FG-PEI, the electrical resistivity of the film decreases and the tensile strength of the film increases, and elongation at break of the film decreases. The thermal stability of WPU is improved after being modified by FG-PEI. The study results show that the modification WPU with FG-PEI can improve the electrical conductivity and water resistance of the film, thus the film has good performance.