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By inserting Ti sheet between ceramic powder and Ti alloy steel, (TiC-TiB₂)/Ti-6Al-4V graded composites were rapidly prepared by SHS centrifugal-casting process under different Ti sheet thickness from 0.5 mm to 1.5 mm. XRD, FESEM and EDS results showed that there was no significant change in phase composition of the ceramic matrix, but promoted the microstructure refinement of the reaction products with the thickness increased. Meanwhile, the introduction of Ti sheet not only enhances the thickness of the gradient interface, but also decreased the thermal infected zone of interface. Moreover, fusion bonding and atomic interdiffusion between liquid TiC-TiB₂ and excessive Ti liquid in thermal vacuum circumstances were considered to initiate peritectic reaction of , direct growth of TiB solids from liquid Ti and eutectic reaction of TiB solids and liquid Ti at the final stage of joint solidification, so that consumption of TiB₂ solids and increase of TiB crystal improved the interface residual stress, and the joint of the ceramic to Ti alloy was achieved in multilevel and multiscale. The joint in better thermal match and continuously-graded microstructure represents not only a transitional change in Vickers hardness but also the high shear strength of 316±25 MPa between the ceramic and Ti alloy.