Research results: With the increasing of embedding depth，the microstructure feature of intact loess changed gradually from the bracketed-macropore weak-cemented texture to the inlaid-micropore half-cemented texture，the void properties changed from bracketed-macropore void to void among grains，then to micropore void. The microstructure feature of loess was one of important factors which dominated the characteristics of the strength and deformation of loess， upper Q3 loess layers，with greater stabilizability of microstructure than changeability，the curves types of stress-strain of loess in the process of loading appeared as the softening obviously deformation properties. With the increasing of embedding depth and confining pressures，the stabilizability of the microstructure of lower Q2 loess layers was less than its changeability，and the curves types of stress-strain of loess in the process of loading put up the hardening observably deformation properties.