Abstract: The essay adopted the self-developed seepage device to gas seepage character research within the operation of stress field and temperature field.Through this experiment came out the results as following: Axial stress causes less seepage on coal sample than enclosing stress does;seepage rate in coal sample rises with temperature;seepage rate makes a negative exponent relation to axially effective stress,effective enclosing stress σ_a and average effective stress σ₀;the experiment also got the expression between seepage rate and stress and temperature.By using Darcy's law,a seepage equation of coal-seam gas in stress field and temperature field was deduced out,which is able to simulate the underground seepage characters of methane in high stress field and temperature.