Abstract: This paper gives a detailed observation of the st ructural properties of intact loess. Based on the results of triaxial compression tests of intact lo ess, a quantitative parameter of structural properties, which can not only refle ct the microstructure and arrangement of the particles but also the microcosmic mec hanic characteristics due to the particular coherent structure of soil particle s, has been proposed to explore the structural properties of soil.At the same t ime ,based on the analysis of plentiful test results, not only the rationality, sens itivity and stability of the fabric index, but also the variat ion of quantitative parameter m_ó and the influence factors of so il structure have been revealed and verified.These works will provide a good fo undation for the deep research on the structural properties of loess.