This paper describes a study of the performance of hydraulic lime modified soil material for soil site collapse. The research results show that hydraulic lime modified soil material display little color change, a low shrinkage rate, no cracking, good water stability, high compressive strength, good resistance to freezing and good resistance to dry-wet alternations. Compared with the performance of traditional lime, hydraulic lime modified soil materials is more suitable for soil site collapse disease restoration and reinforcement. This research provides scientific basis for protection and restoration of soil sites.