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The Ti-Pd alloyed layer was prepared on pure titanium by the technique of depositing palladium film and thermal diffusion. The corrosion resistance of Ti-Pd alloyed layer was studied. The corrosion rate of the alloy layer was evaluated by gravimetric method. The surface morphologies and composition of different samples after corrosion were analyzed. The results show that the corrosion rate of the Ti-Pd alloyed layer in 37% HCl and 80% H2SO4 is two orders of magnitude lower than that of pure titanium. It is found that after the alloyed layer is corroded by 37% HCl,the surface contains Ti,Pd,O elements,and the surface has tiny pitting pits. On the other hand,after the Ti-Pd alloyed layer is corroded by 80% H2SO4,the surface contains Ti,Pd,S,O elements,and the surface has submicron pitting pits. According to the experimental results,the corrosion resistance mechanism of the Ti-Pd alloyed layer is proposed in this paper. A small amount of Pd and TiO2 constitute a passive film,which improves the surface corrosion potential,thereby improving the corrosion resistance of the material.