A innovative technique named acid zinc dipping method was developed and applied to the pre-treatment process for electroplating on titanium alloy.The surface was activated and the problem of poor bonding strength at the interface was solved.For optimal performance of the metal coating,the effect of P contcent on bonding strength of electroless nickel coating was further investigated.After improved pre-treatment method and optimal process,electroless nickel,silver,gold coatings with high bonding strength were prepared respectively on the surface of TC4 and TA1 titanium alloys.The bonding strength of coatings was characterized by thermal shock test and cross cut test.The microstructure of coating was characterized by scanning electron microscopy(SEM)，energy dispersive spectroscopy(EDS),3D microscopy and metallographic examination.Moreover,electrochemical property,conductivity and thermal radiation performance of coatings were also measured.Results show that through employing acid zinc dipping pretreatment method and adding medium phosphorus electroless nickel coating as bottom layer,the bonding strength,corrosion resistance,conductivity and thermal control performance of coating are significantly improved.The corrosion potential of electroless nickel coating increases by 60 mV compared to that of titanium alloy substrate,and increases by 600 mV in case of gold coating.