Abstract: Through the analysis of the occurrence mechanism of rock burst in the southern area at Wudong coal mine with steep and extra-thick coal seam, combined with the special geological conditions for coal seam, the mechanism of rock burst in the area is analysed and verified, then the unloading measures of rockburst prevention in coal and rock mass are put forward as this basis, the effect of control measure is evaluated at last. The results show that:Rock burst is formed at the action of rock pillar leveraging,crustal stress and the lithology of coal and rock, the clearance way of "main is unloading for the rock mass, minor is for coal mass" is put forward. The measures release the accumulated elastic energy in rock mass, which also reduces the brittleness and capacity of accumulation high energyfor the coal, achieving the aim of reducing the harm of coal and rock burst.