Abstract：Polymer materials have wide prospect of application to soil solidification engineering. SH is a new water-soluble solidification material. Based on the uniaxial compressive strength test，and modern analysis methods such as X-ray diffraction(XRD)，Fourier transform infra-red(FTIR)，scanning electron microscope，X-ray energy dispersive spectrum(EDS) and surface area/micro porosity，the mechanism and strength characteristics of the SH solidified loess are analyzed. The research results show that the strength of the solidified loess increases with the content of SH，but the interrelationship is not linear，and long-term strength of solidified loess is very high. After loess is solidified by SH，the compressibility decreases，and the collapsibility is lost. The admixing of the SH changes the structure of the loess. It makes the connection of loess grains stronger. By hydrogen bond，ion exchange，absorption of macromolecular and flocculation；the physicochemical interaction may occur between SH and the loess. This may be the main reason for the improvement of the strength of the loess.
