The work aims to explore effects of N content on microstructures and tribological properties of CrCN coatings. The CrCN coatings were prepared by adopting micro-arc ion plating technology. The N content of the coatings was changed by regulating flow amount of nitrogen gas. Cross section and surface morphology of the coatings were evaluated with SEM and AFM. Bonding strength between the coatings and substrate was determined in scratch method. Microhardness of the coatings was characterized with Vickers hardness tester. Friction coefficient of the coatings was measured with pin-on-disc friction and wear tester. As the nitrogen flow increased gradually, microstructure of the coatings evolved from dense and small grains to a larger columnar structure with porous grains. When the nitrogen flow was 3 mL/min, dispersed hard phases in the coatings had obvious strengthening effect, the bonding strength increased to 41 N and hardness to 1476HV, while the friction coefficient increased slightly. Properties of the coatings degraded as the nitrogen flow further increased. The structure and properties of CrCN coatings can be greatly optimized, and an optimal combination of bonding strength, hardness and friction coefficient can be achieved by controlling N content in the coatings based upon nitrogen flow regulation.