Abstract: The coal gangue is resources put in wrong places, for better application of coal gangue, we tested physical properties of coal gangue and analyzed the staged upward mining; the technical plan using bagged coal gangue stacking tier in gob-side entry retaining at the staged upward mining is proposed, the effect of three different stacking tier methods(vertical, alternate, mixing) used bagged coal gangue are studied, the results show that it can endure the effect of two times mining dynamic by the bagged coal gangue stacking tier, and it can avoid the effect of water seepage in the goaf.