Slope protection components made of sandy soil,cement,and a stabilizer named SY were investigated.Unconfined compressive strength and freeze-thaw cycle tests were carried out by samples with maximum dry density.Results present that all the engineering properties of the stabilized soil samples are improved significantly and SY stabilizer,cement,and sandy soil have coordination.From SEM pictures and mechanism analyzes,it can be proved that for sandy soil which has more pores in micro-structure,AFt Crystals,SiO2 gel,and C-S-H gel fill pores well,which makes the micro-structure denser and the expansion of AFt Crystals.They all benefit macro-engineering properties of stabilized sandy soil.SY solidified soil components satisfy the quality requirements in slope protection engineering and have high economic,social,and ecological values.