Abstract: In order to deeply probe the coal-gas migration rule in the roadway in the process of coal and gas outburst, experimental study was carried out on the migration rule of coal-gas flow in the process of outburst in the "H"-type roadway by using the self-developed simulation experiment device of coal and gas outburst dynamic effect. The results showed that about 60.453 kg of coal powder was blown out when the gas pressure was 0.35 MPa, the coal powder was mainly accumulated in the main roadway and presented a trapezoidal distribution, and there was almost no coal powder accumulation in the connection gate and branch entry; the gas pressure frequently fluctuated in a very short time (t< 1.5 s) at the same measuring point along the roadway and the peak value of gas pressure at different measuring points in the main roadway assummed an attenuated tendancy along the roadway. In addition, the existence of the shock wave was confirmed by experiments, and the propagation velocity of the shock wave in the main roadway was about 368.1 to 434.2 m/s.