Abstract: With the advancement of coal mining in China to deeper strata, the mutual influence of various disasters in coal mines is deepening. In order to explore the triggering conditions of coal-rock gas composite dynamic disasters, quantitatively describe its evolution process and reveal the disaster mechanism, a gas-solid coupling model of gas-bearing coal-rock combination is established and solved by COMSOL Multiphysics finite element analysis software. The results show that the stress of coal body can be divided into stress unloading zone, stress concentration zone and original stress zone after the instability and failure of coal-rock combination. In the stress concentration area, the vertical stress reaches the peak value, while the gas pressure is equal to the atmospheric pressure at the exposed surface, and increases sharply with the increase of depth. It reaches the maximum at the stress concentration and is greater than the initial value. Compared with outburst, compound dynamic disasters mostly occur in the case of low gas pressure, high coal strength and close to roof strength. However, these conditions are still not enough to cause mine pressure bump. No matter what type of disaster, the increase of gas pressure will strengthen the intensity of disaster, and when the disaster occurs, the gas pressure will decay rapidly, showing irregular characteristics. The research results are of great significance to deeply explain the formation and development mechanism of coal-rock gas composite dynamic disasters.