For the purpose of investigating the effect of soil stabilizer on mechanical properties of loess, relationship among amount of soil stabilizer addition, curing age and compaction, shear strength, permeability of loess were studied by comparing the test results of compaction, direct shear and permeability before and after adding the SSA soil stabilizer in loess. The results showed that the optimum water content decreased and the maximum dry density increased with the increasing of SSA soil stabilizer content. Cohesion and internal friction angle increased with the increasing of soil stabilizer content and curing age. Permeability coefficient decreased with the increasing of soil stabilizer content and curing age. The study suggests that the suitable addition amount of SSA soil stabilizer should be about 1% and the curing age should be at least 7 d.