Abstract: In this paper, learning from the formation mechanism of magmatic rock in Qidong Coal Mine, we analyzed the distribution characteristics of magmatic rock intrusion, and the influence of magmatic rock intrusion to coal structure, the cause and distribution of tectonic coal, and abnormal gas occurrence, and illustrated the control function of rock intrusion to coal and gas outburst.The results show that the magmatic rock mainly intruded along the upper coal seam, which can change the lithology of partial coal seam roof and form a dense gas barrier layer, leading to significantly abnormal vertical zonation in coal and coal property, and the increase of the secondary hydrocarbon gas content, both of which control the abnormal gas occurrence. Tectonic movements were accompanied by magmatic activity, which has formed the concentration area of tectonic coal and local stress. The stress analysis shows the central air-return roadway is nearly SN direction.The angle between the maximum principal stress and roadway is large, and the coal stress of roadway in the drilling process is high, then the tectonic coal has formed. Meanwhile, the ability of tectonic coal to resist the external destruction is small, resulting in frequency occurrence of dynamic phenomena in the region.

Key words: magmatic rock intrusion, coal structure, tectonic coal, gas occurrence, coal and gas outburst