Abstract: In order to reduce the calculation errors of the hot－moist parameters of the mine moist air，an atmospheric humidity map with universal applicability for wet air at different atmospheric pressures was made by systematically combing the calculation methods of hot－moist parameters and considering the characteristics of the increase of the temperature，humidity and pressure of the mine wet air with the increase of mining depth．This paper analyzed the influence of the change of the temperature，humidity and pressure of the mine moist air on its hot－moist parameters．it pointed out that the errors caused by the calculation of the general parameters should be avoided，and if the change of air pressure in different mining depths was neglected，the error of the moisture content would be larger than that of the enthalpy calculation．