The study looked at how the roof of thick coal seams with high angles breaks for the first time. They used a model to calculate how the roof bends and stresses. They found that the angle of the seam affects how far the roof breaks first. The shape of the broken roof in high-angle seams is different from flat ones. The order of breaking in high-angle seams is middle-middle upper-middle lower-upper-lower. These findings help understand how the main roof breaks in highly inclined coal mines.