Abstract: To fully understand the characteristics and the hazardous effects of coal and gas outbursts and to further investigate its influences on the secondary catastrophes, a coal and gas outburst model has been developed based on the fundamental theory of compressible flow dynamics and gas flow dynamics in porous media. Meanwhile, the calculation results of different cases have been compared with the experimental data to validate the model. The results show that the calculation results have a quite good coincidence with the experimental results and the model is quite accurate. The model can simulate and describe the whole coal and gas outburst process including its happening, developing and decaying phases and can be used in mines.