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The "Kunlun" bridge erection machine integrates the transportation and erection of simply supported box girder, and can directly lift and transport box beams to reach the on-site station beams. The main beam of the bridge erecting machine is connected with the traveling mechanism of the front vehicle and the traveling mechanism of the rear vehicle, and the traveling mechanism of the rear vehicle is connected with the main beam through a ball joint.Because the main beam is very long, the front and rear vehicle running mechanisms are driven by two independent closed hydraulic systems, and the number of drives is large, which makes it difficult to ensure synchronization and coordination.During the running process of the whole machine, whether the front and rear running drives are synchronized directly affects the control effect and mechanical performance.Through the analysis of the lateral and longitudinal walking characteristics, the modeling of the driving model, and the deduction of the driving synchronization algorithm, the synchronization algorithms used in the two walking modes are determined.Based on the determined synchronization algorithm, the hardware and software programming design of the control system is completed, and through on-site debugging and trial, this problem is finally solved, which effectively ensures the synchronization of the whole machine and reduces the asynchronous transmission of the walking system to the main beam. The external force improves the running efficiency of the rack-transporting machine and ensures the stable operation of the equipment.