Coal-seam faults refer to those where their planes are developed along thecoal seams and are at a low angle to ot nearly parallel to the planes of the coalseams. Their significant diagnostic criteria are fault plane, tectonoclastic coal andsharp variation in coal seam thickness. Coal-seam faults can either exist indepen-dently or co-exist with other geological structures; they can convert into eachother. Coal-seam faults ofter develop in such specific coal seams, as rather low inmechanic strength, present of gas pressure and/or with deformation shearing.Coal seam faults are widespread in coal fields especially in those where coalmeasures are highly deformed. It is important to study the structural feature ofthese faults because the coal-seam fault zone is high in gas content, a possible ora dangerous zone for coal and gas outburst. In this respect, coal-seam faults appearto control the spatial distribution of the dangerous zone of coal and gas outburst.Therefore, the dangerous zone of gas outburst could be predicted through thestudy of the coal-seam fault zone.