[Objective] To investigate the solidifying capability of soil stabilizer EN-1 on loess soil.[Methods] Direct shear experiments with 4 loessial soils of Lou soil, sand soil, loessal soil and yellow brown soil, with different solidifying agent content and curing age are conducted.[Results] EN-1 can improve the shear strength of the four types of soil, especially the cohesion of soil in Yangling District and Ankang City.[Conclusion] The amount of EN-1 needs to be appropriate, as excessive amount of EN-1 may reduce the shear strength of soil. The optimal amount of EN-1 is 0.01%, and the optimal curing age is 28 d. Soil stabilizer EN-1 is more suitable for soil with high clay content, rather than soil with high sand content.