Abstract: In view of the characteristics of flash welding system for large section rolling steel billet,mechanical kinematic models of welding equipments were built by using dynamics simulation software ADAMS. In which forging hydraulic servo system nonlinear model of the flash butt welding process was proposed in AMESim. Moreover,the servo control system for virtual welding system was built by utilizing the Simulink package of MATLAB software. By analysis of the data transmission characteristics between simulation softwares,a shared channel for dynamic data carrier was established by MATLAB software. A digital platform of welding electromechanical system was brought into forward,by which virtual experiment on electromechanical system of billet flash welding process can be carried out.