A nanolayer WN/TiN coating was grown using an industrial-scale four-target reactive sputtering system. Effects of heat treatment on fundamental properties and wear performance of the nanolayer coating were studied. For comparison, a single layer TiN was used as a reference. Characterization was carried out using a nano hardness tester, GDOES, XRD and SEM. Wear performance was evaluated using an SRV® wear tester. It was found that the as-deposited nanolayer WN/TiN coating showed relatively high nano hardness and wear resistance as compared with the single layer TiN. The heat treatment resulted in performance degradation of the nanolayer coating. After 600 heat-treatment, the nanolayer coating showed very poor mechanical performance.