Two-stage underground coal gasification is an effective method which can produce water gas with high heating value

while the temperature is the key factor that determines on its producing process. On the basis of model test

the mathematical model for two dimensions

non-linear

unsteady temperature field is established through analyzing the distribution law of temperature field for combustion and gasification of coal seam in the stove

and outlining and treating the boundary conditions. A selection method of the model parameters has been introduced. The mathematical model is solved by the control volume method

and calculation results are analysed. The uniformity of calculation and real measurement value indicate that the numerical simulation of dynamic state temperature field for the coal seam medium in the gasification stove is correct.Thereby

it provides a necessarily theoretical base for further quantitative study on process of underground coal gasification.