Abstract: Different Ti C contents reinforced Co matrix composite coatings were prepared on the surface of 45 steel by laser cladding technology. The microstructure of the coatings was observed by metallographic microscope, the hardness and wear properties of the coatings were tested. The results show that, the surface forming of Co-based composite coatings with different Ti C content is smooth. The microstructure of Ti C reinforced Co matrix composite coating is mainly regular dendrite structure and the second phase Ti C particles with different sizes and irregular shapes. With the increase of Ti C mass fraction,the number of the second phase in the cladding layer section increases continuously. When the Ti C mass fraction is 40wt%,the whole coating is almost uniformly filled by the second phase particles, and the cracking tendency of the cladding layer increases. When the Ti C mass fraction is less than 20wt%, the hardness is slightly lower, and the average hardness ranges from510 HV to 570 HV. When the Ti C mass fraction is 30wt%, the hardness increases to 650-700 HV. When the Ti C mass fraction is 40wt%, the hardness can be increased up to 840 HV. The wear resistance of the cladding layer also increases with the increase of Ti C mass fraction. However, when the Ti C mass fraction is 40wt%, the wear resistance decreases.