Since the terahertz wave frequency range is in the junction area of electronics and photonics, it has both some electric wave characteristics and some light wave characteristics, so it has many different applications, such as: homeland security detection, national defense (terahertz radar), Terahertz detection has shown obvious advantages in astronomical observation, non-destructive testing, especially in the quality control of pharmaceutical production. Of particular note are terahertz applications in biomedicine. The label-free recognition of biological macromolecules such as amino acids and proteins has attracted great attention from experts in the field of terahertz; terahertz medical imaging and tomography are expected to be widely used in biological and medical diagnosis and detection, especially terahertz Some progress has been made internationally in the detection of skin diseases and breast cancer. In addition, the role of terahertz waves in cell therapy has been proven: irradiating the human body with terahertz waves can improve the disordered human cell environment, activate cell molecules, effectively promote the vibration of DNA and other organic polymers, and strengthen DNA. The repair mechanism can activate aging cells, promote microcirculation of capillaries, and enhance human immunity.