Abstract: In order to reveal the mechanism of the rock burst with Horizontal sectionTop Coal Caving in the steeply inclined thick coal seam, the geological conditions and mining conditions of the mine are taken as the object of the 5521-21 working face of Yaojie No.3 Mine. Based on the impulse power source, it is found that the superposition effect of static and dynamic load is the core of 5521-21 working face.The prevention and control measures of coal body pressure relief blasting, bottom coal pressure relief blasting, coal body large diameter drilling pressure relief and roof deep hole pre-splitting blasting are carried out, and good results are obtained through inspection.