Abstract: Three-dimensional model was constructed for analyzing flow field distribution in gob under condition of gas gushing and coal spontaneous combustion. Model similarity is researched, and the flow field features of the model are carried out experimental research. Research shows that the flow pattern of model roadway is closed to turbulent fluid and enters automatic simulation area, and the model has better sealing under conventional ventilation pressure; the pressure did not appear systematic offset and is stable relatively; the gas field appeared stable state field after fifty minutes in weak gas emission actions; the physical characteristics of model are consistent with prototype.