Abstract: Tunable diode laser absorption spectroscopy (TDLAS),a line-of-sight technology, is used to measure the temperature,velocity,concentration and other parameters in the flow field.As a fast and efficient diagnostic tool,TDLAS sensors have wide applications in the devel-opment of the combustion and propulsion system.TDLAS sensors play more and more important role in the improvement of the system performance.When new concept propulsion appears,the sensors face new challenge,at the same time,relevant technology have been improved.The de-velopment of the TDLAS technique,applications in the combustion diagnosis and enormous po-tential have been summarized.This review can provide enlightenment and help for the research-ers in this field.