backfill of the land base;  Enumeration method;  Optimize

The purpose of treatment of bad foundation soil is to improve the bearing capacity of foundation soil. Taking the optimal selection of backfill land foundation treatment scheme of Longhu New Town villa as an example, the optimal decision-making method of enumeration method of bad foundation treatment scheme in actual engineering is introduced, and the deep mixing pile method is selected by comparing and optimizing the four schemes of ash soil squeezed pile method, CFG pile method, strong compaction method and deep mixing pile method. The treated foundation soil not only meets the design requirements such as bearing capacity, but also reduces the investment, which has certain reference value for similar projects.