Aiming at the specific application of terahertz wave detection and communication, the four kinds of 0.36 THz terahertz wave directional antennas, including feed horn antenna, double paraboloid Cassegrain antenna, lens antenna and offset feed single reflector antenna, are respectively designed, analyzed, simulated and fabricated based on microwave and millimeter-wave directional antenna design and application. The design and analysis of the above several terahertz wave directional antennas can provide theoretical and practical basis for the directional detection and communication application of terahertz wave technique that is based on the microwave double frequency technique.