Increased applications of titanium and its alloys as biomaterials originates from their lower modulus, superior biocompatibility and better corrosion resistance when compared to conventional stainless and cobalt-based alloys. The topics of this book are composed of two parts, one is bioactive surface using inorganic treatments and grafted ALP molecule, and the other is the effects of rapid solidification and Cu addition on microstructures and martensitic transformation behaviors in Ti-Ni alloy.