Abstract: Ti alloy has been widely used on aviation and space navigation industries,but its poor wearing resistance,along with the easily produced fricative adhesion on surfaces and the damage sensiveness to micro-drive wearing,has limited its further applications.The WC-8Co coating produced by electro spark deposition on Ti alloy can effectively improve substrate's wearing resistance.In this paper the behaviour of the interface between substrate and coating was discussed,as well as the micro-structure form of the intersection and the microstructure features between layers,was also observed and analyzed.The coating has superfine micro-structure se that the wearing resistance of the surface was effectively improved.