Abstract: In order to study the effect of TiB2 on microstructure and sliding wear resistance of Co-based alloy coating,laser clad Co-base alloy and metal-ceramics layers of Co-based TiB2 was obtained on low carbon steel surface by means of 5kW continuous wave CO2 laser.The results showed that TiB2/Co metal-ceramics composite coating was mainly consisted of γ-Co,Cr23C6,TiB2,TiC and CO3Ti;the Co-based alloy coating was consisted of developed dendrite and hypoeutectic structure.Cinquefoil grain and fine eutectic structure were observed in the TiB2/Co metal-ceramics coating;the microhardness and sliding wear resistance of the TiB2/Co metal-ceramics coating were more excellent than that of Co-based alloy coating.These results are expected to provide available reference for further research of laser cladding metal-ceramics.