Abstract: A method for creating a long superconducting wire and tape materials that can be loaded with high current densities using MgB2. The method is based on the powder-in-the-tube technology. In this process, there is a composite consisting of a cover tube made of material with normal conductivity, and a powder of a superconducting compound or a preliminary product. This powder compound contained in this cover tube, are processed by reshaping and thermal treatment steps to the superconducting wire or tape material. According to the invention, a composite is supplied to the processing process that contains a powdery superconducting MgB2 compound or a powdery preliminary product for a superconducting MgB2 compound. The powdery preliminary product, has been only partially reacted to an MgB compound, or is a powder mixture consisting of the individual components of the desired MgB2 compound. This product is filled into the cover tube.