Electroplated Ni interlayer was used in the diffusion bonding of ZrC–SiC composite. The interfacial reaction focused on Ni-SiC reaction system. Corresponding reaction products were identified to be Ni₂Si and graphite. An optimal Ni interlayer of 4 μm, which was precisely controlled by adjusting the plating time, was designed to ensure a reliable bonding for full ceramic joints. Shear strength of the electroplating assisted joints reaches 183 MPa and 45 MPa at room temperature and 800 °C, respectively, which are 9% and 67% higher than that of the traditional joints bonded with thicker Ni foil.