WC-Co cemented carbides were prepared by powder metallurgy and high temperature liquid sintering with TiCN content of 0,0.5wt%,1.0wt%,1.5wt%,2.0wt%, respectively. The effects of TiCN content on the micromorphology, densification performance and mechanical properties of the cemented carbide were studied. The results show that when TiCN content was no more than 1.0wt%, the grain size of the cemented carbide distributed evenly and less defects such as holes, microcracks and impurity segregation were observed; when higher than 1.0wt%, the amount of defects increased and the size bacame larger. With the increase of TiCN content, the densification performance of the cemented carbide decreased; the Vickers hardness increased and then decreased; the bending strength and fracture toughness first decreased then increased slightly and then decreased. When the TiCN content was 1.0wt%, the comprehensive performance of the cemented carbide was the best.