Abstract: Superconductors are suitable for fabricating terahertz emitters and detectors due to the well-known Josephson effect. Since the energy gap is much higher compared with traditional superconductors, high-temperature superconductor terahertz emitters and detectors are featured with broad frequency range and high operation temperature. We will introduce recent progresses in the Research Institute of Superconductor Electronics (RISE), Nanjing University on intrinsic Josephson junction terahertz emitters and bicrystal grain boundary Josephson junction terahertz detectors made of high-temperature superconductors.