Abstract: In order to study the relationship between the outburst danger of the seam opening in the mine cross cut and the in-situ stress, a theoretical analysis an d numerical simulation method were applied to study the stress and displacement evolution features during the full process of the seam opening when the mine cross C ut and the max horizontal stress was in a different included angle. The results showed that Bailongshan Mine was a typical tectonic stress field. When the mine cross cu t was headed to the coal and rock interface, a remarkable stress concentration was occurred in the surrounding rock and the outburst danger was high. After the stage of the coal cross cut passed, the coal mass would be deformed and seriously failed. With the cross cut and the max principal stress included angle increased, the stres s concentration coefficient and the displacement variation gradient would be steadily increased, the stability of the cross cut would be reduced and the outburst danger could be increased. When the included angle was 15° ~ 75°, the stress would be concentrated to the wall. The heading of the seam opening cross cut should possibly b e paralleled to the max horizontal principal stress. When the included angle was high, while an advance pressure releasing conducted, the coal seam should be enhanc ed and the mine roadway sidewall should be reinforced.