A physical model on the volatilization combustion of coal field fire area was established based on its characteristics. The quality exchange equation, momentum equation, diffusion equation and energy equation with the thermal and quality exchange, with the chemical reaction and multi¬-composition flow was analyzed by analytic geometry method. The parameters of volatilization combustion speed, the content of the volatile component and the flame temperature was gained at relatively still high temperature environment. According to the result, the flame temperature of the volatilization combustion of coal field fire area is the heat insulation temperature calculated based on the low-heat value of the volatile component. In the actual fire area, because of the free or forced convection, the true temperature would be lower than in the calculation. The numerical simulation reveals the airflow distribution of static pressure of coal outcrop. The difference between static pressure and dynamic wind pressure changed with a high degree of change is proposed. The variation of gas transfusion direction and velocity in the coal outcrops and the transfusion depth between static and airflow is analyzed near the coal outcrop.