Abstract: To reduce high geostress on surrounding rock of gob-side entry retaining in deep coal mining，weighing feature of gob-side entry retaining is analyzed base on key block of voussoir beam，So that we proposed the technology of presplitting blasting caving，including of deep hole pre-split blasting technology and strike small angle level drilling group roof cutting technology，cutting off the strike and dip direction of thick and hard roof in coal face，and the side of entry will formed under the action of periodic weightings, which can separate the goaf and support the overlying moving strata, and improve the surrounding rock stress environment，to achieve the goal of reducing broken length of working face roof and beam cantilevers of roof in goaf side.