The fingerprint absorption spectrum of mid infrared fundamental frequency is characterized by strong absorption,broad and dense spectral lines. In general,as molecules absorbing infrared spectra have mid infrared base frequency absorption intensity near 3000cm -1 that is about two orders of magnitude higher than that of the near infrared absorption,and thus it has gradually become a research hotspot for cavity ring down spectroscopy (CRDS) technology. In this paper,the working principle and technical advantages of CRDS technology are briefly described,and the characteristics of mid infrared CRDS technology are introduced. Moreover,the differences between near infrared and mid infrared CRDS technology are analyzed and compared. The research status of CRDS technology based on mid infrared band is discussed finally.