Abstract: Under the principle of "waterproofing-oriented, shallow treatment" of collapsible loess foundation treatment, the lateral restraint waterproof foundation of "lateral water stop by compaction pile + full closure of the foundation bose + shallow replacement" is proposed, and field test research is carried out. Related foundation deformation and water infiltration research findings show that lateral-restrained waterproof foundation in the case of water immersion has a good waterproof effect and protect the foundation does not occur in large collapsible deformation, and the foundation structure in the collapsible loess area road construction has a strong technical feasibility.