With the development of wireless mobile communication technology，the demand on wireless communication rate and frequency increases year by year. Existing wireless mobile communication frequency has the tendency of being saturated, yet terahertz spectrum is a new space. In this article, the latest research progress of terahertz communication at home and abroad are summarized according to the method for terahertz wave generation，and the possible future application of THz communication systems in Radio over Fiber communication，space application, and the field of military are also discussed.