Method determining goaf ignition process

The invention discloses a method determining a goaf ignition process; the features are that a model using a grain flow theory is provided, and the model can learn about temperature and temperature rise zone changes at different times in a U-shape ventilation lower goaf residual coal seam nature ignition process; the method comprises the following steps: basic model establishment; correlation parameter arrangement; residual coal ignition microscopic model construction; result analysis. The method can be applied to analyze a goaf spontaneous combustion generation position and a development process.