Abstract: To investigate the influence of different gas sources on the explosion process in single heading roadway, numerical simulation technology system was used to simulate the effect of gas accumulation length and concentration on its explosion characteristics. The results showed that with the increasing of gas accumulation length, the maximum explosion pressure and maximum explosion temperature increased; the parts where the strongest pressure wave was destroyed transferred from the closed end of the roadway to the open end. The maximum explosion pressure increases with the increasing of gas concentration in the range of 6% to 10%. When the concentration exceeds 10%, the maximum explosion pressure decreases with the increase of concentration. The maximum explosion temperature increases with the concentration. The reverse sparse wave and the forward shock wave meet and superimpose for many times, resulting in multiple pressure peaks.