The bio-ceramic coatings containing low silicon was synthesized on TC4 titanium alloy pre-coated HA and SiO2 powder by laser cladding with continuous wave CO2 laser. Microstructure morphology, composition and phase distributions of the composite coating were investigated respectively by scanning electron microscopy(SEM), X-ray energy-dispersive spectroscopy(EDS), X-ray diffractometer(XRD). The bioactivity of coating was investigated preliminarily in the simulated body fluid(SBF). The corrosion behavior of the coating in the SBF was studied by the potentiodynamic scanning of electrochemical corrosion. The results show that the low silicon content bio-ceramic coating was well metallurgical bonded with TC4 titanium substrate. The corrosion potential of cladding layer was improved 84.4 mV compared with substrate in SBF, the corrosion current density decreased by about 6 times compared with base material, large amount of bone like apatite was deposited on the surface of the composite coating in SBF after seven days, which show well corrosion resistance and excellent biological activity.