In order to heat the billet uniformly and to prevent mushy-state materials from cooling by dies, a mushy-state forming method using electric resistance heating is proposed. A laminated plate made of graphite and stainless steel sheets is developed as a heat source. The dies function as electrodes to introduce electric current into the billet. In the experiments with steel dies and an aluminium alloy, the billet heated by electricity without the laminated plate exhibits solid zones contacting the dies. By heating the billet with the laminated plate, the whole billet becomes semi-solid. By using this method, compression test are carried out at the mushy-state temperatures and flow stresses are measured. The electric resistance heating with the laminated plate is applied to thixoforging.