Screen effect in Electromagnetic Casting (EMC) was continuously controlled over a wide range by replacing usually used metal screen with screen coil. The resistance of external coil with an insertable iron core was connected with condenser resonance circuit to obtain stronger electromagnetic fields. As a result, a maximum density of 0.13 T was obtained by this electromagnetic coil. By using this apparatus, the vertical side of levitated liquid metal is made more straight and the stable, vibrationless free meniscus is obtained. The area of horizontal cross section in the melt is also changed by altering the resistance of external coil, being influenced by number of turns and/or length of iron core insertion. This apparatus will contribute to the development of EMC.