Abstract: In order to realize the division of the impact danger zone of steeply-inclined and extremely-thick coal seam in the south mining area of Wudong Coal Mine, the influencing factors of rockburst were determined by comprehensive means such as the in-situ stress tests and the physico-mechanical experiments of coal and rock etc. The intrinsic relationship between different microseismic levels during the mining of upper strata and impact hazard areas was established. At the same time, based on the principle of similarity between the upper and lower strata, the impact zone of the +450 horizontal No. B3+6 fully mechanized top-coal caving face was divided. The results show that the impact hazard areas of the upper and lower layers of the same coal seam in steeply-inclined and extremely-thick coal seam are similar and repeatable if they are mined at the same time. The research results have certain guiding significance for the division of impact hazard zones in the steeply-inclined coal seam.