In this study. the temperature distribution of the Methane-Air premixed flame was measured. In order to enhance the measurement accuracy of the CT-TDLAS (Computed tomography-tunable diode laser absorption spectroscopy). the SMART (simultaneous multiplicative algebraic reconstruction technique) algorithm has been adopted. https://www.roneverhart.com/RME-ADI-2-Pro-FS-R-AD-DA-Converter-Black-Edition-p36310/