Turning experiment of lithium disilicate glassceramic was done with cemented carbide tools. The results indicate that the tool wear is mainly concentrated in the tool tip and flank. The tool wear forms are mainly abrasive wear and adhesive wear. The theoretical model of tool wear volume in turning was established. It is shown that tool wear volume is concerned with the angles of tools and the material properties of artifacts and tools. With the increasement of cutting length, the tool wear volume is increased and the results which are calculated according to the equation are approximately consistent with the experimental results.