Abstract: The microstructural analysis and electrochemical measurements tests were used to investigate the behaviors of TiO₂ and (HAp)-coated Ti-6Al-7Nb alloy in the SBF soluTiO₂n. By using RF sputtering, a thin TiO₂ layer coated the substrate while a thick layer of HAp coated the outer side of surface. The generated middle layer consist of the composite of TiO₂ and HAp which is by AFM characterized as uniformly distributed coating system with nano size. The images of the Scan Electron Microscopy (SEM ) shows that there is no any cracking observed in the outer layer of tested samples due to the use of thin film TiO₂ as mid lead to reduce the difference in the thermal expansion between the HAp material and Ti-6Al-7Nb substrate. The HAp upper layer significantly improve the bioactivity of the Ti-6Al-7Nb alloy. In this study, the bonding strength and the corrosion resistance was improved by using thin layer of TiO₂ . From Electrochemical Impedance Spectroscopy (EIS) study Bod plot, the composite layer of TiO₂ and HAp was suggested by the capacitive act as barrier layer coated substrate and prevent the relays of the ion from metallic. The results shows the values of R_ox (309.2 kΩ cm² ) are greater than for R_ct (19.2 kΩ cm² ) by assumes the presence oxide film increases for coated substrate are greater than that of uncoated which is a result of the presence of coated film that improve the corrosion resistance of the sample.