The epoxy modified grapheme oxide (EPGO) was synthesized via the epichlorohydrin (EPI) modified graphene oxide (GO). EPGO was characterized for its structure and morphology by FTIR, XRD and TEM.EPGO/WPU composites were prepared containing different mass fraction of EPGO (in the effective content of WPU), and the tensile and abrasion resistances of these films were tested. The results revealed that the addition of EPGO could increase WPU tensile strength obviously. When the addition amount of EPGO was 0.8wt%, composite materials tensile strength reached 12.9MPa. Compared with the blank film(without EPGO)，tensile strength improved 67.5%，Young modulus enhance 39.2%, and the abrasion resistance of the film is improved obviously. So the mechanical properties of EPGO/WPU composites were strongly enhanced that is associated with the addition of EPGO.