Abstract: Aiming at the characteristic of pulse submerged arc welding process with change wire-feed system,the simuloting model was developed by the software of MATLAB/SIMULINK which consists of the main circuit simulation model,arc load system simulation model and arc changing system simulation model.The experimental waveform is consistent with the simulating result,which validates the correctness of the model and lies the foundation of application of pulse submerged-arc welding process.