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Bi2212 HTS bulk cylinders have been prepared by the diffusion process for current lead application. The Bi2212 HTS layer is synthesized through a diffusion reaction between a Sr-Ca-Cu oxide substrate and a Bi-Cu oxide coating with Ag addition. The HTS diffusion layer about 150μm in thickness formed around the cylinder 37/29 mm in outside/inside diameter and 200 mm in length. The transport current of the cylindrical specimen exceeds 7,500 A at 4.2 K and self-field, which corresponds to a transport current density of 24,000 A/cm2. The total heat loads, including heat leakage conducted through the cylindrical specimen between 4 K and 20 K and between 8 K and 40 K, are estimated to be 100 mW at 5,000 A and 300 mW at 3,000 A, respectively. Present Bi2212 HTS cylinders with large transport current as well as low joint resistance and thermal conductivity, seem to be promising as a current lead for superconducting magnets.