Molecular absorption spectrum of fluid medium is related to the physical properties of itself，which contain abundant information and have the advantages of high sensitivity, fast response and strong anti-interference ability. The pressure measurement method combined with tunable diode laser absorption spectroscopy is a new idea of pressure and vacuum metrology. In this paper, the basic principle of measuring pressure based on tunable diode laser absorption spectroscopy is analyzed. The direct absorption spectroscopy and wavelength modulation spectroscopy are introduced, and their advantages and disadvantages are compared. The main research research advances and applications at home and abroad in recent years are reviewed. On this basis, the key technical bottlenecks of pressure measurement technology based on TDLAS are summarized, and the main application fields in the future are prospected.