Abstract: The bioactive glass-ceramic powder A-W in which the phosphorite and wollastonite are contained is used to coat twice the Ti-alloy TC4 by way of enamaling process so as to prepare the Ti-alloy matrix composite with bioactive glass-ceramic coating. The effects of mass fraction of the powder A-W and entrapped bubbles in primary coating on the bonding strength between matrix and coating after sintering were investigated. The results show that when the A-W mass fraction in primary coating is 50%, the amount of fused neutral glass in the coating is enough to wet down the matrix so as to bond firmly the powder A-W to the matrix, and the entrapped bubbles in the coating are so small and even as to buffer the sintering stress. It was found that the bonding strength between matrix and coating is higher than 10 MPa. The secondary coating is all of pure powder A-W to ensure the bioactivity of the composite.