When the gas accumulation position, volume and concentration are basically determined, the gas explosion is ignited with the minimum ignition power. The main task is to study the damage effects by explosion shock wave on the roadway structures or barriers within the roadway. That the roadway and its ventilation structures are damaged will have an important impact on some lanes, mine ventilation system as well as the whole mine, which will influence the decision-making during disasters relief. As the experimental studies of damage effect by gas explosion is more difficult, therefore, the numerical simulation and analysis is important and useful. In conclusion, simulation can not only use low-cost way to reproduce gas explosion shock wave propagation and the damage of roadway structures, but also obtain the relationship between explosion damage effect and the volume and concentration.