Abstract: Loess is widely distributed in China, but it has poor engineering properties such as low strength and high collapsibility.The use of Microbially Induced Calcium Carbonate Precipitation(MICP) technology combined with fiber reinforcement to process loess can effectively improve its mechanical properties and water stability.In order to understand the curing effect of MICP combined fiber reinforced loess, the basalt fibers with mass ratios of 0.2%,0.3%,0.4% and 0.5% were added to the loess, supplemented by different proportions of bacterial solution and cementing solution( the volume ratios were 2∶8,3∶7,4∶6 and 5∶5).The loess was reinforced by mixing method, and the calcium carbonate production test, unconfined compressive strength test, disintegration test and SEM microscopic test were carried out on the treated samples.The results show that:(1) MICP mixed loess can effectively improve its mechanical properties.The amount of calcium carbonate generated in the solidified sample is directly proportional to the peak strength, and the maximum amount is 1% of the loess mass.When the volume ratio of the bacterial liquid to the cementing liquid is 4/6,the curing effect is the best.(2) When the volume ratio of bacterial liquid to cementing liquid is fixed at 4∶6,the unconfined compressive strength of the solidified sample increases first and then decreases with the increasing of the fiber content, and the optimal fiber content is 0.4 %.(3) The complete disintegration time of the loess solidified by MICP is prolonged.When the volume ratio of the bacterial liquid to the cementing liquid is 4∶6,the sample has the strongest disintegration resistance.(4) When the volume ratio of bacterial liquid to cementing liquid is fixed at 4∶6,the disintegration resistance of the sample gradually increases with the increasing of the fiber content.When the content is 0.5%,the final disintegration rate of the sample is the lowest.(5) The calcium carbonate crystals in the sample are attached to the surface of soil particles and fibers in a sheet shape, which can effectively increase the bonding and friction between soil particles and fibers, and has a good promoting effect on the strength and water stability of the solidified soil.The research results can provide a guidance for the practical application of MICP technology in the future engineering of solidified loess.