Two kinds of WC/C coatings were deposited on the polished surface made of chromium molybdenum steel with carburizing and quenching. One is conventional WC/C coating and the other is WC/C coating with about 1μm CrN interlayer. The WC/C coatings were scratch-tested, and friction coefficient, critical load, and peeling behavior were evaluated. The friction coefficient of WC/C coatings were about a half of that of non-coated specimen. The critical load of WC/C coatings was independent on the CrN interlayer. Although the failure of substrate was negligible in the WC/C coated specimen without the interlayer, that was comparatively large in the WC/C coated specimen with the CrN interlayer. The amplitude of AE signal was large in the WC/C coated specimen with the CrN interlayer. While the CrN interlayer would improve the adhesion between the WC/C coating and the substrate, the large adhesion would negatively affect to the wear of the substrate ; the substrate was simultaneously removed with the peeling of the WC/C coating