In order to achieve high-precision measurement of combustion field temperature， the TDLAT temperature measurement system was established by combining tunable diode laser absorption spectroscopy （TDLAS） and computed tomography （CT）. Using DFB lasers with center wavelengths of 1 388 nm and 1 343 nm， under the scanning frequency of 10 kHz， the 64-path CT measurement unit was used to measure the absorbance of the methane premixed flame of the three-jet burner， and the laser absorption results were reconstructed in 2D. The results show that： the temperature of Φ10 and Φ8 jet was basically the same. The maximum temperature could exceed 1 700 K. The temperature of the Φ6 jet center was relatively low， about 1 500 K， and the flame area was small. Comparing the reconstruction results with the thermocouple results， the temperature distribution of the two was basically the same， and the TDLAT technology had higher accuracy and resolution. The feasibility and accuracy of TDLAT technology applied to flame temperature 2D temperature measurement was thus verified.