Abstract：In order to understand the mechanism of coal and gas outburst，the large-scale test device for coal and gas outburst simulation is developed. The device is composed of outburst assembly，fast-releasing component，load-bearing frame，electric servo-controlled loading system，reversal unit，main frame bracket and accessories. The functions of this test device are analyzed as follows. (1) By using the electric servo-controlled loading system，uniform load and step load on the outburst coal sample can be realized；meanwhile，the outburst phenomenon caused by the concentrated stress in front of the coal face can be simulated. (2) This device can simulate five kinds of coal and gas outburst experiments on coal beds with different obliquities，which are under the different gas pressures and geostresses. (3) The foam-stainless steel is used to separate the coal sample from the air intake on the soleplate of the outburst assembly to realize the plane-charging for the outburst coal sample. (4) By using the fast-releasing component，the outburst ostium can be opened at once and its pressure will become zero. (5) The full process of coal and gas outburst can be monitored by this device. The experimental results indicate that the typical outburst hole appears，the powder coal shows the obvious separation；and the larger the outburst intensity is，the larger the gas pressure is. The experimental results agree well with the in-situ outburst characteristics and indicate that the large-scale coal and gas outburst simulation test device can simulate the outburst of coal and gas effectively.
