The Zr coating was deposited on titanium surface using the magnetron sputtering technique. Effects of Zr coating on microstracture and mechanical properties of porcelain fired to titanium have been investigated. The results show that interdiffusion of elements occurs during porcelain firing, and the Zr coating can effectively protect titanium surface from excess oxidation. The strength of bond zone with Zr coating deposited for 1 hour reaches 29.7 Mpa, which has increased by 26.4% as compared with that of bond zone without coating (23.5 Mpa).