Abstract: PTFE and WC nano particles strengthened nickle base nano composite coatings were prepared by electro-brush plating on W18Cr4V high speed steels with different surface roughnesses.The morphology of surface and cross-section of the nano composite coatings was studied by SEM and the effect of surface roughness of substrate on the wear resistance,corrosion resistance and bind strength of the nano composite coatings were studied.The results show that with the decrease of the substrate surface roughness,surface of the nano composite coatings became smootner and denser,the microstructure became finer and more uniform,the coatings thickness reduced,cracks number decreased,and the wear resistance,corrosion resistance and bind strength were obviously improved.