Abstract: A simple and visual calorigenic model was developed via FEM for FSW (friction stir welding) process, which was applied to the dynamic simulation of temperature field in the process. Then, the thermal cycling curves at different time and different positions are given to make sure of how the temperature field is space-time distributed with different welding parameters. The results indicated that the maximum welding temperature is 496.5°C, i.e., lower than the melting point of Al-alloy. The temperature at different positions along the welded seam increases rapidly from its initial value to about 500°C then reverts slowly to the initial one. The nearer the position to the welded seam, the quicker the temperature rise and the higher the maximum temperature available. The temperature field is affected greatly by welding parameters in FSW process.