According to the geological conditions of the large sandstone pit and the peripheral conditions, the ideal comprehensive application of vibor-replacement stone column, dynamic replacement & dynamic composite foundation treatment and heavy compacted crushing stone pile in Shangzhuangdonglu backfill roadbed of sandstone pit was introduced. At high water level, for the sandstone pit back-filled with soft soil and construction waste, vibro-replacement stone column was taken as the seepage tunnel, by dynamic replacement to form vertical reinforcement with the treatment depth increasing, and finally the compound treatment scheme of compact consolidation was adopted. For the backfill roadbed at both sides of bridge pile, the scheme of heavy compacted crushing stone pile was used in order to reduce the impact to bridge pile.