Abstract: In this study, the authors deposited a layer of TiN coating on the surface of cemented carbide ZK1 using hot cathode ion plating technology, and conducted oxidation resisting experiment at the temperature between 300℃ and 700℃ in air condition.The micro-structure and componential analysis was conducted by using XRD and XPS; the fracture property was detected with SEM.The micro hardness was tested by micro-hardness tester and the adhesion strength was tested with a scratch tester.The experimental results show that the coating has an average thickness of 5μm, the main component is TiN, with an average micro-hardness of 2388HV and the max adhesion strength achieves 85N.With the increase in temperature, the component of the coating changes to TiN_xO_y and TiO₂ later.Both the micro-hardness and adhesion strength have a falling trend when temperature increases.