The terahertz absorption spectrum of the insensitive explosives RDX and HMX in the spectral range from0to2.5THz with terahertz time domain spectroscopy were detected.The terahertz absorption spec-trum and the characteristic absorption peak of samples were acquired.And the position of characteristic absorp-tion peak was determined，analyzed and compared with the detected absoption spectrum from other research in-stitutes.The results show that the terahertz time-domain spectroscopy can be used to detect and identify explo-sives as well as the slight component change of samples.It also offers the scientific basis of establishing the fingerprint spectrum library with the terahertz time-domain spectroscopy.