The spatial and temporal distribution of air temperature after methane explosions in drivage roadway is studied based on the relationship between overpressure and temperature which is found based on gas equation, dynamic and functional principles. The moment temperature distribution after methane explosions under different concentrations of methane is got through solution to the overpressure model and connection with experimental data. Based on unsteady mass and heat transfer, and other physical phenomena, the controlling equations of mass, momentum and energy are founded. The instantaneous temperature distribution after methane explosions is used as one kind of initial conditions of RNG k-ε model to solve the spatial and temporal distribution of temperature in drivage roadway. Studying on it has great meaning to understand the mechanism of sub-fire or sub-explosions induced by initial explosions. It could provide some understanding and helpful methods to prevent and control those sub-disasters.