Abstract: Taking the air inlet system of mining area in a coal mine as the prototype, the simulation and experiment system of mining tunnel fire is established based on the fluid similarity theory; according to the energy conservation law, the relevant experimental work of tunnel smoke flow speed during fire period is done, which includes test, calculation and analysis. The grid division of experimental model roadway is carried on by GAMBIT software. By setting the boundary and initial conditions of smoke flow during fire period in FLUENT software, using RNG two-equation turbulence model, energy equation and SIMPLE algorithm, the steady state numerical simulation of tunnel smoke flow velocity in mine is done to obtain the change regulation of tunnel smoke flow velocity during fire period.