Biomaterials are compatible with neighbouring tissues while implanted in body and do not cause any undesirable reactions such as coagulation and inflammation. Metallic biomaterials have found wide spread application as orthopedic prosthesis and dental implants due to their high strength, great biocompatibility and corrosion durability. But their acceptance by the living tissues in the body is very difficult, if not impossible, as they are bioinert. It is a widespread method to coat the metallic implant surfaces with bioactive ceramic films in order to increase their compatibility and improve bone apposition in the body. Although various calcium phosphate (CaP) based bioactive ceramic compounds with structure similar to the bone exist, hydroxyapatite (HAP) coatings, that has approximately the same composition with biological apatite in the body, create interests in recent years. In this study HAP films coated by electrochemical deposition method on CoCrMo implant materials and effect of solution temperature on the films were determined.