Abstract: The characteristics of billet flash butt welding on endless welding rolling were analyzed. To meet the demand of synchronization in butting phase, a scheme to predict and control the synchronization error besed on neural network was presented. A nonlinear hydraulic system and a coupling model were designed with AMEsim. Through the interface between Simulink and AMEsim, cosimulation was achieved. The result shows that the pre-controller exhibits excellent performance.