Along with the fast development of super rapid laser technology,Terahertz band gap has been understood gradually.Because terahertz wave is in the special position of the electromagnetic spectrum,it has many different special qualities from the other bands of electromagnetic wave,and has broad application prospects in many fields.Based on the characteristics of terahertz wave,we study the application prospect in the military field.In the end,it is concluded that terahertz wave has application prospects in warning aerospace planes,supersonic aircraft and terminal guidance.