Abstract: Relic soil sites are disappearing gradually due to the damage of their external environment and themselves' worse physical and mechanical properties. The collapsed and sapping at part of relic soil sites can be recovered by mixing then backfilling. The surface which was weathered away needs spray or hole grouting consolidation. In this article, we research into NaCl solute's migration, the collapse resistance ability, dry wet circulation resistance ability and freeze circulation resistance ability of relic soil sites with different dry density values. The relic soils are reinforced by penetrating the high polymer material SH in the perspective of mass loss. We discover that after penetrating SH, the ability of collapse resistance is improved greatly. The ability of dry-wet circulation resistance increases with the growth of dry density. The change of freeze circulation resistance ability is influenced by both water content and dry density. The lower dry density, the higher value of equilibrium moisture content. SH can inhibit water to migrate to the upper. At last, we explain the above experiment phenomenon reasonably.