A fuel control system for humidified air turbine, comprising: a compressor which compresses intake air into high pressure air; a gas turbine combustor, which generates a compressed gas; a turbine driven by the combustion gas; a humidification tower that is configured to humidify the high pressure air into humid air; and a recuperator, in which the humid air is heated by exhaust gas discharged from the turbine thereby forming high temperature air, wherein the gas turbine combustor includes plural combustion units comprising plural fuel nozzles that are configured to supply fuel and plural air nozzles that are configured to supply a portion of the high temperature air, in order to burn the fuel and the portion of the high temperature air to generate the combustion gas, a first group of the plural combustion units having a higher flame stabilizing performance than a second group of the plural combustion units, characterized in that the control device is configured to: compute an air humidity of the humid air, wherein air humidity is computed as a ratio of a saturated vapor pressure to a measured internal pressure of the humidification tower, wherein the saturated vapor pressure is calculated from an internal air temperature in the humidification tower; compute a combustion air temperature based on the computed air humidity, the measured internal pressure of the humidification tower, and the internal air temperature of the humidification tower; compute a combustion temperature from the computed combustion air temperature; compute a calculated F1 bias by comparing the computed combustion temperature to a known combustion temperature required to ensure stable combustion, wherein the calculated F1 bias is a bias of fuel flow fed to the first group of the plural combustion units; set a first fuel flow ratio, at which fuel is fed to the first group of the plural combustion units as a function of the calculated F1 bias; and set a second fuel flow ratio, at which fuel is fed to the second group of the plural combustion units. a compressor which compresses intake air into high pressure air; a gas turbine combustor, which generates a compressed gas; a turbine driven by the combustion gas; a humidification tower that is configured to humidify the high pressure air into humid air; and a recuperator, in which the humid air is heated by exhaust gas discharged from the turbine thereby forming high temperature air, wherein compute an air humidity of the humid air, wherein air humidity is computed as a ratio of a saturated vapor pressure to a measured internal pressure of the humidification tower, wherein the saturated vapor pressure is calculated from an internal air temperature in the humidification tower; compute a combustion air temperature based on the computed air humidity, the measured internal pressure of the humidification tower, and the internal air temperature of the humidification tower; compute a combustion temperature from the computed combustion air temperature; compute a calculated F1 bias by comparing the computed combustion temperature to a known combustion temperature required to ensure stable combustion, wherein the calculated F1 bias is a bias of fuel flow fed to the first group of the plural combustion units; set a first fuel flow ratio, at which fuel is fed to the first group of the plural combustion units as a function of the calculated F1 bias; and set a second fuel flow ratio, at which fuel is fed to the second group of the plural combustion units.