Metallic materials have been used to make human implants for over 400 years.Pure gold plates were firstly used to repair skulls and fix false teeth.Thereafter, people used silver sheets, iron sheets and wires to fix fractured joints. In the 1950s, with the development of the rare metal industry, human implants made of titanium, niobium and zirconium were used for clinical trials. Through related researches and numerous clinical trials, titanium has been recognised as the most desirable metal for human implants. Hundreds of metal parts such as femoral heads, hip joints, humerus, skull, knee joints, as well as vascular dilators, splints, prostheses and fasteners etc. made of titanium have been transplanted into the human body with excellent effect and have been highly evaluated by the medical experts.