As an important force bearing and force transmitting component in the bridge substructure, the pier plays a key role in the normal operation and maintenance of the bridge structure. For the cast-in-situ wet joint fabricated pier system, the mechanical performance of joints is the key to affect the stability of the overall structure. The promotion and application of ultra high performance concrete (UHPC) provides an excellent material selection for the cast-in-situ wet joint fabricated connection. Starting from the application status of UHPC in the field of bridge engineering, and based on the mechanical properties of joints, this paper systematically summarizes the cooperative work ability between UHPC and ordinary concrete (NC) and reinforcement, as well as the influencing factors of bonding (bonding) performance; The application and mechanical characteristics of UHPC in fabricated piers are summarized. The results show that the bonding performance between UHPC and NC is good, and it is affected by UHPC age, interface roughness, fiber length in UHPC, anchorage length of reinforcement and interface reinforcement ratio; The bond strength of UHPC reinforcement is significantly better than that of NC reinforcement. The bond performance of UHPC reinforcement is related to the thickness of protective layer, UHPC curing age, stirrup configuration, reinforcement strength, UHPC compressive strength and fiber volume ratio in UHPC;UHPC can give full play to the mechanical properties of high-performance materials in the cast-in-place wet joint fabricated connection. No matter at the pier pile cap joint or cap beam pier column joint,under the premise of reasonable reinforcement configuration and protective layer thickness, it can achieve the same connection effect of cast-in-place structure, and greatly ensure the overall stability; UHPC can not only be applied to the connection of Precast Pier Column Joints,but also be used with high-strength reinforcement to strengthen the weak parts of the pier at the same time, so as to achieve the reinforcing effect of restoring the seismic performance of damaged pier columns and even optimizing the performance.