Abstract: An engineering thermodynamic model was developed for the gas turbine for low heating value（LHV）syngas. The mathematical model has been validated against the industrial operational data and was employed to investigate the large temperature discrepancies observed among different sensors monitoring the exhaust from gas turbine. The reason of the large discrepancies found during industrial operation was attributed to the deviation between the flowrates of compressed air from the compressor to the combustors at left and right sides using the thermodynamic model. Finally, a method to reduce the exhaust temperature discrepancies was proposed.The method can quickly calculate required syngas flowrates to combustors at left and right sides based on the differential pressure differences from the outlet of the compressor to the annular spaces located on top of the combustors at left and right sides and the deviations of measured exhaust temperatures via the validated mathematical model. The simulated verification of varying the syngas flowrates to the combustors at left and right sides shows that the relative deviation of the exhaust temperatures can be lowered from average 3.55%（equivalent to average 29.7℃） at industrial operation to average 0.14%（equivalent to average 1.2℃）according to the calculation with the proposed method. The syngas variations according to the proposed method does not impact the stability of the combustion inside the combustors,but can lead to slightly lower NOx emissions at all power loads through CFD simulation.