In the present report, data are presented on the transition temperatures and the critical currents of laminated Nb3Sn and Nb3Al0.8Ge0.2tapes. The samples were prepared by rolling techniques and diffusion process. At first, the plates were prepared by accumulating foils of materials alternatively. Then the plates were rolled to a flexible tape and heat‐treated. By heat treatment the transition temperatureTcof Nb3Sn tape increases and reaches the constant value ≃ 18.0°K for 10 min at 1050°C. For Nb3Al0.8Ge0.2,Tc= 19.2°K is obtained by heat treatment at 1600°C for 1 min and annealing at 760°C for 2 h. The critical currents of the samples are discussed.