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Despite their importance, electron-doped in nite-layer cuprate superconductors Sr1ကxLnxCuO2 (Ln = La, Gd, Sm) have not been studied in detail, due to the lack of single-phased compounds with a high volume fraction of superconductivity. Using high-pressure ( 4 GPa) and high-temperature ( 1000 C) annealing conditions, we successfully produced single-phased compounds with almost 100 % superconducting volume fraction. From the magnetization measurement, we found that these electron-doped cuprates are very similar to conventional superconductors, but quite different from typical hole-doped cuprate superconductors.