The magnetic field intensity of central electromagnetic stirring equipment and the melt pool’s electromagnetic force were simulated, and the influence of rotating magnetic field on melt pool electromagnetic force,the flow field and temperature distribution of the meltpool was analyzed by finite element method.The results showed that the electricity magnetic in melt pool decreased slowly at first when increasing the current frequency, and the power loss increased rapidly at the same time,when frequency continued to rise, the electromagnetic force increased gradually and the power loss became stable at this time.And the magnetic field strength of electromagnetic stirrer changed periodically in one exciting current cycle.Under the condition of rotating magnetic field,the temperature and the temperature gradient of melt pooldecreased, and circulation in melt pool circumferential direction formed and its velocity distribution was uniform.