Abstract: To improve the corrosion resistance of TC4 titanium alloy and enhance the bonding between the coatings,Zirconium dioxide/hydroxyapatite composite coatings were prepared on titanium alloy substrates by hydrothermal-electrode position method at different deposition current densities. The microscopic morphology and phase composition of the coatings under different processes were characterized by electron scanning electron microscopy SEM and X-ray diffractometer XRD. The bond strength and corrosion resistance of the substrate and different composite coatings were investigated using scratch method and electrochemical measurements. The wettability of the matrix and coatings was evaluated using a contact angle tester. The results show that the coating crystallinity and bond strength are highest at a current density of -2 mA. The best corrosion res istance is demonstrated in human body simulating fluid with self-corrosion current and corrosion potential of 2.78×10^-9 A·cm^-2 and -470.75 mV, respectively, which is two orders of magnitude higher compared to the substrate, and the impedance（EIS） test shows that the composite coatings prepared with -2 mA has better electrochemical properties. Zirconium dioxide as an intermediate layer improves the bonding between the matrix and the hydroxyapatite coating, and the composite coatings prepared under the process with a current density of -2 mA possess high crystallinity and bonding strength, and their corrosion resistance is superior to both other processes and matrix.