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Humidification is an important step in humid air turbine system. The calculation on humidification is carried out at 423.15-573.15K, 5-15 MPa. The results suggest that to produce high-enthalpy moist air, high water temperature and large water flow are needed. The water temperature is the most sensitive parameter to the humidification tower. And it is better for the humidification tower to work at temperature higher than 523 K when the system pressure is higher than 5 MPa. The comparison between the model used in this paper and ideal model shows that the ideal model can be used in simulation to simply the calculation when the temperature is lower than473 K and pressure is lower than 5 MPa.