Abstract: To solve the intense first weighting interval of ChaHasu mine fully-mechanized coal face, eliminate hidden danger, The application of deep hole presplitting blasting technology in 31307 full mechanized coal face by theoretical calculation, field test method. Through the analysis of ground pressure, results show that the first weighting interval of roof is 41.2m, the face’s roof weighting step and weighting strength decreased significantly Compared with the previous two working face. Less influence on hydraulic support and avoid the goaf hurricane risk factors and has ensure the safe production of the working face. It provides a good reference for forced roof caving under similar conditions of Xinjie mining area.