Combined with engineering examples, this paper mainly introduces the use of PLC synchronous intelligent jacking system, the use of its "industrial computer + programmable controller + hydraulic control system" to form a distributed control system, to achieve displacement control synchronization, cyclic jacking, until the jacking height reaches the design requirements, to replace the support construction. This method effectively solves the problem that there is no direct lifting space between the beam bottom and the cover beam, and provides reference and experience for the construction of similar Bridges in the future.