Multi-layered functionally graded (FG) structure Ni?W/Er2O3 nanocomposite films were prepared by continuously changing the de-position parameters, in which the Er2O3 and W contents varied with thickness. The microstructure and chemical composition of the electrode-posited Ni?W/Er2O3 films were determined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The anti-corrosion and wear properties of the electrodeposition films were investigated by electrochemical measurement and ball-on-disk friction test. The microhardness distribution of the cross section of nanocomposites was measured by nanoindentation. The results showed that with de-creasing agitation rate or increasing average current density, the contents of Er2O3 nanoparticles and tungsten were distributed in a gradient along the thickness, and the contents on the surface were larger. By comparison, FG Ni?W/Er2O3 films had better anti-corrosion and wear properties than the uniform Ni?W/Er2O3 films. Atomic force microscopy (AFM) and profilometry measurements indicated that Er2O3 nano-particles had an effect on the surface roughness.