Both calcium source and admixture have an effect on the reinforcement effect of microbial induced calcium carbonate precipitation (MICP). In order to explore the effects of different concentrations of admixtures (AlCl3?6H2O) and calcium sources on the curing effect of MICP, the sand column test and aqueous solution test were carried out, and different concentrations of AlCl3?6H2O were added to the cementing solution for perfusion test, and the unconfined compressive strength and calcium carbonate content after reinforcement were tested. The MICP reinforcement effect of calcium chloride and calcium acetate were analyzed, and the improvement of MICP reinforcement effect under different concentrations of AlCl3?6H2O under the two calcium sources was analyzed. The effect of aluminum ions on the composition and morphology of calcium carbonate was analyzed by SEM. The results showed that calcium acetate as the calcium source had a better curing effect. After adding aluminum ions, the strength optimization effect of calcium chloride as a calcium source is more obvious. Among them, the concentration of AlCl3?6H2O at 6mmol/L was the optimal concentration under the conditions of this study, which was conducive to reducing the number of perfusions, saving raw materials and reducing economic costs. Aluminum ions contribute to the formation of calcium carbonate crystals, enhance the adsorption of sand particles, and improve the curing strength. The concentration of aluminum chloride has a significant effect on the curing effect of MICP under different calcium sources, which is of great significance for practical application.