Abstract: The study aimed at the impacts of the different landforms on the soil physical composition, soil moisture content and soil fertility of the slope loess field under sand cover.The series of samples were collected at section planes and vertical soil layers, in Yinmaquan watershed located on the boundary between Shenmu County and Dongsheng City, where the slope field had the representations.The soil texture, gravimetric soil moisture content and organic matter content of the samples were measured.Based on the analysis of the data, conclusions were obtained:1) The soil texture and physical clay granule content were indices to indicate the desertification degree and evolvement trend.The study area demonstrated a drier and coarser trend towards northwest.2) There were different evolution laws of soil moisture content with different landform positions.It increased vertically from the top to upside of hilly slope, but decreased from the downside to foot.Whatever position the landform had, there was a similar balanced depth existed for the soil to evaporate, infiltrate, leak and hold water.3) The physical clay granule content had closely relationship with the soil fertility and moisture content.The section planes with higher physical clay granule contents had richer soil fertility and more moisture content.4) Effects of the combination of water, fertilizer and organic matter became more effective from the top to the foot of slope field, indicating that landform always had significant impacts on the series of evolution processes such as soil mellowing processes, soil degradation, soil erosion and soil desertification.Furthermore, the results also highlighted the evolution of soil texture with the landforms and the vertical soil layers, and could indicate the process of soil desertification and materials sources.