Abstract: In order to describe the process of gas emission in coal particle more accurately, the experiment of gas emission in coal particle in limited space was designed.The results showed that the reciprocal of gas accumulated emission amount was linear to that of nth power of time, and the fitting degree was above 0.99, from which the gas emission model in coal particle was obtained.The mathematical model of gas emission in limited space was constructed based on Darcy law, and the changes of cumulative emission amount and emission velocity with time in gas flow process under corresponding pressure in experiment were obtained by means of finite difference method and programming.The accuracy of the model of gas emission in coal particle was verified theoretically by comparative analysis.The simulation results are in good agreement with the experimental results and further demonstrate that the gas flow in coal particle accords with Darcy law.