Because of the different conductivities between the primary phase (low electric conductivity) and the metal melt, electromagnetic force (EMF) scarcely acts on the primary phase. Thus, the primary phase is moved in the direction opposite to that of the EMF when the metal melt with primary phase solidifies under an electromagnetic field. Based on this, a new method for production of in situ surface composites by EMF is proposed. This method has the advantages of being simple and inexpensive, and therefore, has bright prospects for application.