The bonding strength of WC(0001)/TiN(111) interface depends on the interface properties. The binding strength, interface energy, electronic structure and bonding of the WC(0001)/TiN(111) interface were investigated by first principles.The results show that: (1) for all interfaces, the order from large to small is C-HCP-Ti(9.19 J/m2), W-OT-Ti( 4.28 J/m2) and W-OT-N( 2.98 J/m2). (2) the interface bonding mode of C-HCP-Ti is strong covalent bond, the binding strength of the two is the strongest. The bonding mode of W-OT-Ti interface are covalent bond and partial ionic bond, which are inferior to that of C-HCP-Ti interface binding strength. For W-OT-N, the interface binding strength is metallic bond, and the binding strength is relatively weak. (3) for these three types of interfaces, the interface energy of W-OT-Ti, W-OT-N and C-HCP-Ti in the whole ΔμC range can be negative, which indicate that these three interfaces have ultra-high stability.