Abstract: In order to improve the validity of the refuge chamber and reduce the damage of its blast airtight door from the gas explosion,the gas and coal-dust explosion process in unidirectional roadway with the refuge chamber was simulated by using numerical method,and the impact of the refuge chamber layout was analyzed.The loading laws of blast airtight door were further discussed.The results showed that the load force suffered by the blast airtight door can be considered as the step load and the refuge chamber should give priority to adopt the layout of a 45 ° angle with the roadway.