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The range profile is studied first in the microwave band.With the advent of the terahertz radar technology,the range profile is studied from microwave band to the terahertz band,which is the terahertz range profile(TRP).The outstanding feature of TPR is that it can obtain the 3-D shape and the range information of the target by one ultra-short pulse without scanning system.In this paper,terahertz range profile theory and simulation is investigated.