Abstract: How the temperature filed changes with the electromagnetic field was theoretically analyzed for low frequency electromagnetic casting (LFEC) and the results were experimentally verified by continuous temperature measuring in the casting process. It is shown that the forced convection of melt resulting from low frequency electromagnetic field functions as stirring the melt, thereby promotes the inside heat exchange of the melt and enhances the heat transfer between melt and mould and between melt and solid/liquid interface. A very uniform temperature field of melt was thus formed with almost the same temperature. It is also found that adjusting casting temperature can not change the melt temperature too much, indicating the low sensitivity of LFEC to the casting temperature.