The cp-Ti and Ti-6Al-4V substrates were blasted with HAp and HAp/Ti mixed powders at room temperature using a wet blasting machine. The surface of substrate was found to be coated with HAp and HAp/Ti composite which was clearly showed HAp peaks from both XRD and EDS analysis. Anyhow, CaTiO_3 was occurred at low volume ratio of HAp in HAp/Ti mixed powder. The HAp attached tightly to the substrate, at least at the microscope level. It was stable against ultrasonic vibration for at least 5 min. The reaction between HAp and its substrate might be strong mechanochemical bonding which could produce a strong coating for biomedical application.