Abstract: Exploring the fractal characteristics and distribution of soil particles in the root zone of sand fixing plants in the desert oasis transition zone can provide a theoretical basis for regional desertification prevention and ecological construction.Three types of sand fixing plants（Nitraria sphaerocarpa, Calligonum mongolicum, and Haloxylon ammodendron） were selected in the transitional zone between desert and oasis in the northern part of Linze County as the research objects.Samples of soil were collected from the root zone of sand-fixing plants, within the 0～120 cm soil layer.The composition of soil particle sizes was measured, and the fractal dimension（D） of the soil particles was subsequently calculated.The results indicate that the soil particles within the root zone of three sand-fixing plants are mainly medium sand（0.25～0.5 mm） and fine sand（0.1～0.25 mm） Mainly, accounting for over 75%,with the lowest content of clay particles; Except for medium sand and fine sand, the contents of different size particles decreased in the order: extremely fine sand＞coarse sand＞silt＞clay; Distinguishable disparities（P＜0.05） were evident in the soil particle composition within the root zone of the three sand-fixing plants.The content of fine and extremely fine sand particles in the soil of the root zone of Calligonum mongolicum were significantly higher than those of the Nitraria sphaerocarpa and Haloxylon ammodendr on.The content of fine particulate matter in the soil of the root zone of Nitraria sphaerocarpa is significantly higher than that of Calligonum mongolicum and Haloxylon ammodendron; There were also significant differences in the fractal dimension D of soil particles in the root zone of the three sand-fixing plants（P＜0.05）,Nitraria sphaerocarpa（2.00）＞Haloxylonammodendron（1.94）＞Calligonum mongolicum（1.91）,and shallow（0～60 cm） soils were easily disturbed by external factors, and the fractal dimension D of soil particles underwent substantial changes.The fractal dimension D of soil particles exhibits a strong positive correlation with the quantity of clay and silt in the soil.Conversely, it demonstrates a pronounced negative correlation with the quantity of sand particles in the soil.The fractal dimension D of soil particles can effectively demonstrate the characteristics of soil particle composition in the root zone of sand-fixing plants.Improving the number and coverage of sand fixing plants is of great significance for fixing sandy soil, improving soil quality, and preventing wind erosion.