<p>Solidification of aeolian sand in desert regions is a key problem in land desertification control and sandstorm prevention. Finding cost-effective, environmentally friendly and highly durable sand prevention and control methods is a top priority. Microbially induced calcite precipitation (MICP) has become a popular research direction in recent years because of its high efficiency, environmental protection and durability. Aeolian sand is characterized by small particles, low water content, poor permeability and low shear strength. Further verification is required for the application of aeolian sand solidification using MICP. In this paper, taking desert aeolian sand as the study object, the effects of dry density, number of cementation, standing time, and other factors on the strength characteristics of aeolian sand solidified by MICP were analyzed by performing unconsolidated undrained (UU) triaxial tests, and the quantitative relationships between the cohesive force, internal friction angle, and CaCO₃ generation were established. We also constructed the microscopic structure of solidified aeolian sand based on scanning electron microscope (SEM) tests, revealing the mechanism of action of MICP-solidified aeolian sand. According to the test results, the deviator stress of solidified aeolian sand first increased and then decreased with increasing axial strain. Ultimately, the deviator stress tended to be stable. The peak deviator stress of the solidified aeolian sand increased with increasing initial dry density, number of cementation and standing time. Both the cohesive force and internal friction angle of aeolian sand samples solidified by MICP increased with the increase of CaCO₃ generation, showing correlation coefficients of 0.91 and 0.92, respectively. When CaCO₃ crystals were distributed on the surfaces of sand particles, they mainly filled the pores of the sand particles, helping reduce the permeability of the aeolian sand. When CaCO₃ crystals were distributed between sand particles, they had a cementing effect, which turned point contacts between sand particles into surface contacts and improved the overall strength of the aeolian sand. The findings of this study are of important reference value and great scientific significance for guiding the practice of wind prevention and sand solidification in desert regions.</p>